{"title":"Dobsonian Wheeley Bars","description":"\u003cp\u003eSky Trekker and triangle-style dollies sized to Dobsonian rocker boxes, from 8-inch tubes up to the largest truss Dobs, plus the Ez-Glide kit that converts a rocker box you already own.\u003c\/p\u003e\u003cp\u003eGoods ship factory-sealed. Tell us your Dobsonian's make and aperture and we'll confirm the fit before you order.\u003c\/p\u003e","products":[{"product_id":"jmi-sky-trekker-200-wheeley-bar-dobsonian-telescope-dolly","title":"JMI Sky Trekker 200 Wheeley Bar — Dobsonian Telescope Dolly","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Sky Trekker 200 Wheeley Bar is a Dobsonian dolly for telescopes in the 8″ to 10″ class. The assembled Dob sits on a welded steel frame carried on four 10″ pneumatic tires, which lifts the ground board about 3.5″ clear and rolls the whole telescope out to the observing spot in one piece. The frame measures 27″ wide at the rear wheels by 37″ long, takes ground boards up to 22″ in diameter, and ships at 16.0 lb. JMI builds it in the USA.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you keep an 8″ or 10″ Dobsonian assembled in a garage, shed or spare room and would rather roll it out than carry the rocker box each session. It also suits observers who want the telescope to clear the ground by a few inches and to travel on air-filled tires instead of hard casters, so the trip out to the pad copes with a lawn, a gravel strip or a cracked driveway.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for 8″–10″ Dobsonians:\u003c\/strong\u003e Fits ground boards up to 22″ in diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo published foot spacings:\u003c\/strong\u003e Accepts a centre-of-foot to centre-of-foot span of 10.875″–12.0″ (276–305 mm) or 14.3″–15.4″ (363–391 mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10″ pneumatic tires:\u003c\/strong\u003e Air-filled all-terrain tires are standard across the Sky Trekker series, with no wheel upgrade to select.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.5″ of lift:\u003c\/strong\u003e Raises the telescope roughly 3.5″ off the ground once it is on the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27″ × 37″ footprint:\u003c\/strong\u003e 27″ across at the rear wheels and 37″ front to back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking wheels and leveling bolts:\u003c\/strong\u003e The wheels lock at the observing position and leveling bolts take up slope in the surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelded steel:\u003c\/strong\u003e One-piece welded steel construction, made in the USA by JMI.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA Dobsonian ground board rests on three feet, and the Sky Trekker 200 is built around the spacing of those feet rather than the diameter of the board alone. JMI publishes two accepted spans — 10.875″–12.0″ and 14.3″–15.4″ measured centre-of-foot to centre-of-foot — which is why two Dobs with the same stated aperture can sit differently on the same frame. Once the board is down, the leveling bolts are wound to bring the azimuth surface flat, and the locking wheels hold the frame still. The 10″ pneumatic tires do the other half of the work: the air in the tire absorbs the ridges and joints that a hard caster would transmit straight into the optical tube, and the 3.5″ of lift keeps the ground board clear of wet grass and gravel on the way out.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRolling an assembled 8″ or 10″ Dobsonian from a garage or shed to a driveway or backyard pad\u003c\/li\u003e\n\u003cli\u003eKeeping a Dob on its dolly permanently so a session starts by opening a door and rolling out\u003c\/li\u003e\n\u003cli\u003eMoving a telescope across grass, gravel or a broken driveway where hard casters would jar the tube\u003c\/li\u003e\n\u003cli\u003eStoring a Dobsonian assembled rather than splitting the rocker box and tube for every session\u003c\/li\u003e\n\u003cli\u003eRepositioning the telescope during the night to clear a roofline, a tree or a neighbour's light\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 200 is designed for Dobsonian telescopes in the 8″ to 10″ class, with a ground board up to 22″ in diameter and a foot spacing inside one of the two published ranges. JMI names the Meade LightBridge 8″, the Orion SkyQuest XT8 and the Celestron and Sky-Watcher 10″ Collapsible Dobsonians among the telescopes it fits. The measurement that decides fit is the centre-of-foot to centre-of-foot distance — the straight-line distance between any two of the three feet under the ground board — rather than the aperture printed on the tube. At 27″ wide the loaded frame passes through most interior doorways of 30″ or more, though garage door tracks and narrow passages have their own dimensions. Larger Dobsonians are covered by the Sky Trekker 300, 350 and 400. Tell us your telescope model, or the distance between two of its feet, and we'll confirm the fit before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit is set by foot spacing, not aperture.\u003c\/strong\u003e The two published spans are 10.875″–12.0″ and 14.3″–15.4″ centre-of-foot to centre-of-foot, and a Dob outside both of them sits outside the published fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe ground board limit is 22″ in diameter.\u003c\/strong\u003e Boards larger than that belong on a bigger Sky Trekker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a Dobsonian dolly.\u003c\/strong\u003e It carries a Dobsonian ground board; tripod-mounted telescopes are served by the Universal Wheeley Bars instead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tires are pneumatic.\u003c\/strong\u003e Air-filled tires hold air pressure, so they are checked and topped up in the same way as any other pneumatic tire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe loaded frame is 27″ wide and 37″ long.\u003c\/strong\u003e Those are the dimensions that have to clear doorways, gates and the route out to the pad.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight is 16.0 lb\u003c\/strong\u003e for the dolly by itself, before the telescope is added.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe dolly arrives as a welded steel frame, so setup is a matter of setting the Dobsonian's ground board onto it within one of the two published foot spacings, winding the leveling bolts to bring the base flat, and locking the wheels at the observing position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is cof-to-cof distance, and how do I measure it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt stands for centre-of-foot to centre-of-foot — the straight-line distance between any two of the three feet on the bottom of your Dobsonian's ground board. That figure is what the 10.875″–12.0″ and 14.3″–15.4″ ranges refer to.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill my Dobsonian fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJMI lists the Meade LightBridge 8″, Orion SkyQuest XT8 and the Celestron and Sky-Watcher 10″ Collapsible Dobs as known fits, with the ground board up to 22″ across. Other Dobs come down to the foot spacing, and we are glad to check yours.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there wheel options to choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The Sky Trekker series ships with 10″ pneumatic tires as standard, which JMI specifies for all-terrain use, so there is no wheel upgrade to add.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit through my doorway?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe frame is 27″ wide, which clears most interior doorways of 30″ or wider. Garage door tracks and unusual passages are worth measuring against that 27″ figure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow high does it lift the telescope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAbout 3.5″ off the ground, which also raises the eyepiece by the same amount at any given altitude.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Sky Trekker 200 is the Dobsonian dolly for the 8″ to 10″ class — ground boards to 22″, a 27″ × 37″ welded steel frame on 10″ pneumatic tires, 3.5″ of lift, locking wheels and leveling bolts, at 16.0 lb and made in the USA. Fit comes down to the spacing of the three feet under your ground board, and we will happily check that figure with you.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296860627055,"sku":"TPWST200","price":608.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/doublebattery-1_9108975e-f622-48af-8282-437b81766388.jpg?v=1781714291"},{"product_id":"jmi-sky-trekker-300-wheeley-bar-dobsonian-telescope-dolly","title":"JMI Sky Trekker 300 Wheeley Bar — Dobsonian Telescope Dolly","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Sky Trekker 300 Wheeley Bar is a Dobsonian dolly for telescopes in the 10″ to 12″ class. The assembled Dob sits on a welded steel frame riding on 10″ pneumatic tires, which lifts the ground board about 3.5″ clear and rolls the telescope out in one piece. The frame is 32″ wide at the rear wheels by 38.4″ long overall, takes ground boards up to 27.5″ in diameter, and ships at 29.0 lb. JMI builds it in the USA.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you own a 10″ or 12″ Dobsonian and the rocker box has reached the size where carrying it out is the part of the night you think about first. It suits a telescope stored assembled in a garage or shed, and it earns its keep on truss-tube Dobs where the rocker box is both heavy and awkward to get a grip on.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for 10″–12″ Dobsonians:\u003c\/strong\u003e Fits ground boards up to 27.5″ in diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo published foot spacings:\u003c\/strong\u003e Accepts a centre-of-foot to centre-of-foot span of 15.75″–16.875″ (400–428 mm) or 19.5″–20.625″ (495–523 mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10″ pneumatic tires:\u003c\/strong\u003e All-terrain air-filled tires are standard, with no wheel option to select.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.5″ of lift:\u003c\/strong\u003e Raises the telescope roughly 3.5″ off the ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e32″ × 38.4″ footprint:\u003c\/strong\u003e 32″ across at the rear wheels and 38.4″ front to back overall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking wheels and leveling bolts:\u003c\/strong\u003e The wheels lock at the observing position and the bolts bring the base flat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelded steel:\u003c\/strong\u003e One-piece welded steel construction, made in the USA by JMI.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eLike the rest of the Sky Trekker series, the 300 is dimensioned around the three feet under a Dobsonian ground board rather than the diameter of the board on its own. JMI publishes two accepted spans — 15.75″–16.875″ and 19.5″–20.625″ centre-of-foot to centre-of-foot — which is how one frame covers both the compact 10″ solid-tube Dobs and the wider-footed 12″ models. The step up from the Sky Trekker 200 is in the frame itself: 32″ across against 27″, and a 27.5″ ground board limit against 22″, which is what carries the extra mass of a 12″ rocker box without the frame working against the board. Leveling bolts take up slope once the telescope is placed, the wheels lock, and the 10″ pneumatic tires absorb driveway joints and lawn ruts on the way out rather than passing them into the tube.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRolling an assembled 10″ or 12″ Dobsonian from a garage or shed out to a driveway or observing pad\u003c\/li\u003e\n\u003cli\u003eKeeping a truss-tube Dob on its dolly permanently so no rocker box lift is involved in a session\u003c\/li\u003e\n\u003cli\u003eCrossing grass, gravel or a broken driveway on air-filled tires rather than hard casters\u003c\/li\u003e\n\u003cli\u003eRepositioning a large Dob during the night to work around a roofline, a tree or a light\u003c\/li\u003e\n\u003cli\u003eStoring the telescope assembled instead of splitting the rocker box and optical tube each time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 300 is built for Dobsonians in the 10″ to 12″ class, with a ground board up to 27.5″ in diameter and a foot spacing inside one of the two published ranges. JMI names the Apertura AD12, the Meade LightBridge 10″ and 12″, the Orion SkyQuest XT12 and XX12, the Zhumell 10″ and 12″, and the Sky-Watcher 12″ among the telescopes it fits. Fit is decided by the centre-of-foot to centre-of-foot distance — the straight-line distance between any two of the three feet under the ground board — rather than the aperture on the tube. At 32″ wide the loaded frame calls for an opening of 32″ or more, so a tight 30″ interior door is narrower than the frame. Smaller Dobs are covered by the Sky Trekker 200, and larger ones by the 350 and 400. Tell us your telescope model, or the distance between two of its feet, and we'll confirm the fit before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit is set by foot spacing, not aperture.\u003c\/strong\u003e The two published spans are 15.75″–16.875″ and 19.5″–20.625″ centre-of-foot to centre-of-foot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe ground board limit is 27.5″ in diameter.\u003c\/strong\u003e Larger boards belong on the Sky Trekker 350 or 400.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe frame is 32″ wide.\u003c\/strong\u003e JMI states that it passes through openings of 32″ and up, and that a tight 30″ interior door will not accommodate it — worth measuring the route out before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a Dobsonian dolly.\u003c\/strong\u003e It carries a Dobsonian ground board; tripod-mounted telescopes are served by the Universal Wheeley Bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tires are pneumatic.\u003c\/strong\u003e Air-filled tires hold pressure and are topped up like any other pneumatic tire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight is 29.0 lb\u003c\/strong\u003e for the dolly alone, before the telescope goes on it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe dolly arrives as a welded steel frame. Setting up means placing the Dobsonian's ground board on it within one of the two published foot spacings, winding the leveling bolts until the base sits flat, and locking the wheels once the telescope is where you want it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is cof-to-cof distance, and how do I measure it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt stands for centre-of-foot to centre-of-foot — the straight-line distance between any two of the three feet on the bottom of your Dobsonian's ground board. That is the figure the 15.75″–16.875″ and 19.5″–20.625″ ranges describe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill my Dobsonian fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJMI lists the Apertura AD12, Meade LightBridge 10″ and 12″, Orion SkyQuest XT12 and XX12, Zhumell 10″ and 12″, and Sky-Watcher 12″ as known fits, with the ground board up to 27.5″ across. For any other Dob it comes down to the foot spacing, and we are glad to check yours.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit through my doorway?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe frame is 32″ wide, so it passes through openings of 32″ and wider. A tight 30″ interior door is narrower than the frame.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there wheel options to choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The Sky Trekker series ships with 10″ pneumatic tires as standard, specified by JMI for all-terrain use, so there is no upgrade to add.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is this different from the Sky Trekker 200?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 300 is the larger frame — 32″ wide against 27″, a 27.5″ ground board limit against 22″, and wider foot spacings — which is what puts 10″ and 12″ Dobs on it rather than 8″ and 10″.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Sky Trekker 300 is the Dobsonian dolly for the 10″ to 12″ class — ground boards to 27.5″, a 32″ × 38.4″ welded steel frame on 10″ pneumatic tires, 3.5″ of lift, locking wheels and leveling bolts, at 29.0 lb and made in the USA. Fit comes down to the spacing of the three feet under your ground board, and we will happily check that figure with you.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296860790895,"sku":"TPWST300","price":636.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/wheeley-bars-6_a7305bfd-9a1d-48f2-a1cf-453a1544a4dd.jpg?v=1781714309"},{"product_id":"jmi-sky-trekker-350-wheeley-bar-large-dobsonian-telescope-dolly","title":"JMI Sky Trekker 350 Wheeley Bar — Dobsonian Telescope Dolly","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Sky Trekker 350 Wheeley Bar is a Dobsonian dolly for telescopes in the 12″ to 14″ class, built around ground boards measuring 28″ to 32″ across. The assembled Dob sits on a welded steel frame carried on four 10″ pneumatic all-terrain tires, which lifts the telescope roughly 4″ to 5″ off the ground and rolls it out in one piece. The frame measures 33″ wide at the rear wheels by 53″ front to back including the wheels, and ships at 40.0 lb. JMI designs and builds it in the USA.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you own a 12″ or 14″ Dobsonian — often a truss-tube model — whose rocker box has passed the point where carrying it out is something you do casually. It suits a telescope kept assembled in a garage, shed or observatory, where the aim is to open a door and roll the whole instrument to the pad rather than make two trips with the heavy end of it.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for 12″–14″ Dobsonians:\u003c\/strong\u003e Built around ground boards of 28″ to 32″ outside diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour 10″ pneumatic tires:\u003c\/strong\u003e All-terrain air-filled tires at all four corners, standard across the Sky Trekker series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4″ to 5″ of lift:\u003c\/strong\u003e Raises the telescope higher off the ground than the smaller Sky Trekker models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e33″ × 53″ footprint:\u003c\/strong\u003e 33″ across at the rear wheels and 53″ front to back with the wheels included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking wheels:\u003c\/strong\u003e Lock the frame in place once the telescope is positioned.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeveling bolts:\u003c\/strong\u003e Bring the azimuth surface flat on sloping or uneven ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelded steel:\u003c\/strong\u003e Designed and built by JMI in the USA.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 350 differs from the 200 and 300 in more than scale. Where the smaller frames are specified by the spacing of the three feet under the ground board, the 350 is specified by the outside diameter of the board itself — 28″ to 32″ — and carries it on four 10″ pneumatic tires rather than a lighter arrangement. The longer 53″ frame puts distance between the front and rear axles, which is what keeps a tall truss-tube Dob settled while it is moving instead of rocking fore and aft over each bump. Lift rises to 4″ or 5″, clearing longer grass and deeper gravel than the 3.5″ of the smaller models, and the leveling bolts then take up whatever slope the observing surface has once the wheels are locked.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRolling an assembled 12″ or 14″ truss-tube Dobsonian from a garage or shed to an observing pad\u003c\/li\u003e\n\u003cli\u003eKeeping a large Dob permanently on its dolly so no rocker box lift is part of a session\u003c\/li\u003e\n\u003cli\u003eMoving a large-aperture telescope across grass, gravel or rough ground on air-filled tires\u003c\/li\u003e\n\u003cli\u003eRepositioning a heavy Dob during the night to clear a roofline, a tree or a light source\u003c\/li\u003e\n\u003cli\u003eObservatory and semi-permanent dark-sky setups where the telescope is rolled out on a regular schedule\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 350 is specified for Dobsonian telescopes in the 12″ to 14″ class whose ground board measures between 28″ and 32″ outside diameter. JMI names the Orion SkyQuest XX12g, XX14g and XX14i among the telescopes it fits, along with other Dobsonians whose boards fall in that 28″ to 32″ range. The outside diameter of the ground board is the measurement that settles fit, rather than the aperture printed on the tube. The loaded frame is 33″ wide and 53″ long, which is what has to clear doorways, gates and the route out to the observing position. Smaller Dobsonians are covered by the Sky Trekker 200 and 300, and the 400 covers the 14″ to 16″ class above it. Tell us your telescope model or the outside diameter of its ground board, and we'll confirm the fit before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit is set by ground board diameter.\u003c\/strong\u003e The published range is 28″ to 32″ outside diameter, and a board outside that sits outside the published fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe frame is long as well as wide.\u003c\/strong\u003e At 33″ by 53″ including the wheels, the length matters as much as the width for doorways, turns and storage space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a Dobsonian dolly.\u003c\/strong\u003e It carries a Dobsonian ground board; tripod-mounted telescopes are served by the Universal Wheeley Bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tires are pneumatic.\u003c\/strong\u003e Air-filled tires hold pressure and are topped up like any other pneumatic tire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLift is 4″ to 5″.\u003c\/strong\u003e The eyepiece rises by the same amount at any given altitude, which changes the observing height compared with the telescope on the ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe dolly weighs 40.0 lb\u003c\/strong\u003e on its own, before the telescope is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 350 and 400 share a published footprint.\u003c\/strong\u003e JMI lists the same 33″ × 53″ frame and the same 28″–32″ board range for both, with the aperture class being the stated difference — we are glad to sort out which model suits your telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe dolly is a welded steel frame, so setup means placing the Dobsonian's ground board onto it, winding the leveling bolts until the base sits flat, and locking the wheels at the observing position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know whether my Dob fits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBy the outside diameter of its ground board, which JMI specifies at 28″ to 32″ for this model. The Orion SkyQuest XX12g, XX14g and XX14i are named fits, and we are glad to check any other telescope against that range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it differ from the Sky Trekker 300?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 300 is specified by foot spacing for 10″ to 12″ Dobs on a 32″ × 38.4″ frame with 3.5″ of lift. The 350 is specified by a 28″–32″ ground board for the 12″ to 14″ class, on a longer 33″ × 53″ frame with four 10″ tires and 4″ to 5″ of lift.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there wheel options to choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Four 10″ pneumatic all-terrain tires are standard on this model, so there is no wheel upgrade to add.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it cross grass and gravel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJMI specifies the tires as all-terrain, and the 4″ to 5″ of lift keeps the ground board clear of the surface, which is what the pneumatic tires are there for.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the telescope stay on it between sessions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt can. Leaving the Dob on the dolly is the usual arrangement, since it removes the rocker box lift from the session entirely.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Sky Trekker 350 is the Dobsonian dolly for the 12″ to 14″ class — a 33″ × 53″ welded steel frame on four 10″ pneumatic all-terrain tires, 4″ to 5″ of lift, locking wheels and leveling bolts, at 40.0 lb and built by JMI in the USA. Fit comes down to a ground board of 28″ to 32″ outside diameter, and we will happily check that figure with you.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296860889199,"sku":"TPWST350","price":826.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/wheeley-bars-3_dccb94bf-0fcc-4ab9-9d17-d6f71f7f8be2.jpg?v=1781714325"},{"product_id":"jmi-sky-trekker-400-wheeley-bar-extra-large-dobsonian-telescope-dolly","title":"JMI Sky Trekker 400 Wheeley Bar — Large Dobsonian Telescope Dolly","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Sky Trekker 400 Wheeley Bar is a Dobsonian dolly for telescopes in the 14″ to 16″ class, built around ground boards measuring 28″ to 32″ across. The assembled Dob sits on a welded steel frame carried on four 10″ pneumatic all-terrain tires and steered with a tow handle, which lifts the telescope roughly 4″ to 5″ off the ground and moves it out in one piece. The frame measures 33″ wide at the rear wheels by 53″ front to back including the wheels, and weighs 30.0 lb. JMI designs and builds it in the USA.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you own a 14″ or 16″ Dobsonian and the rocker box is heavy enough that moving it by hand shapes how often the telescope comes out. It suits large truss-tube Dobs kept assembled in a garage, shed or observatory, and setups where the telescope travels a meaningful distance to a dark-sky pad rather than a few feet onto a driveway.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for 14″–16″ Dobsonians:\u003c\/strong\u003e Built around ground boards of 28″ to 32″ outside diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour 10″ pneumatic tires:\u003c\/strong\u003e All-terrain air-filled tires at all four corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTow handle:\u003c\/strong\u003e Steers the loaded frame from the front rather than pushing it from the rocker box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4″ to 5″ of lift:\u003c\/strong\u003e Raises the telescope clear of grass, gravel and standing water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e33″ × 53″ footprint:\u003c\/strong\u003e 33″ across at the rear wheels and 53″ front to back with the wheels included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking wheels and leveling bolts:\u003c\/strong\u003e Lock the frame at the observing position and bring the base flat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelded steel:\u003c\/strong\u003e Designed and built by JMI in the USA.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 400 is specified by the outside diameter of the Dobsonian ground board — 28″ to 32″ — rather than by the spacing of the feet beneath it, which is how the larger Sky Trekkers differ from the 200 and 300. The tow handle is the piece that changes how a 16″ Dob moves: pulling from the front of a 53″ frame steers the load along a line, where pushing a tall telescope from behind tends to steer it into whatever it was being aimed away from. Four 10″ pneumatic tires spread the mass and take the shock of ridges and ruts in the air rather than through the frame into the optical tube, and the 4″ to 5″ of lift keeps the board clear of the ground on the way out. Once the telescope is placed, the wheels lock and the leveling bolts take up the slope of the surface.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMoving an assembled 14″ or 16″ truss-tube Dobsonian from a garage or shed to an observing pad\u003c\/li\u003e\n\u003cli\u003eTowing a large-aperture Dob across a longer run of ground to a dark-sky position\u003c\/li\u003e\n\u003cli\u003eKeeping a large Dob permanently on its dolly so the rocker box is never lifted\u003c\/li\u003e\n\u003cli\u003eCrossing grass, gravel and uneven surfaces on air-filled all-terrain tires\u003c\/li\u003e\n\u003cli\u003eRepositioning a heavy telescope during the night to work around obstructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Sky Trekker 400 is specified for Dobsonian telescopes in the 14″ to 16″ class whose ground board measures between 28″ and 32″ outside diameter. JMI names the Meade LightBridge 16″ and the Orion SkyQuest XX12g, XX14g and XX14i among the telescopes it fits. The outside diameter of the ground board settles the fit rather than the aperture printed on the tube. The loaded frame is 33″ wide and 53″ long, which is the dimension that has to clear doorways, gates and the route to the observing position. Smaller Dobsonians are covered by the Sky Trekker 200, 300 and 350. Tell us your telescope model or the outside diameter of its ground board, and we'll confirm the fit before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit is set by ground board diameter.\u003c\/strong\u003e The published range is 28″ to 32″ outside diameter, and a board outside that sits outside the published fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe frame is 33″ by 53″ including the wheels.\u003c\/strong\u003e The 53″ length matters as much as the width for doorways, turns and storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a Dobsonian dolly.\u003c\/strong\u003e It carries a Dobsonian ground board; tripod-mounted telescopes are served by the Universal Wheeley Bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tires are pneumatic.\u003c\/strong\u003e Air-filled tires hold pressure and are topped up like any other pneumatic tire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLift is 4″ to 5″.\u003c\/strong\u003e The eyepiece rises by the same amount at a given altitude, which raises the observing height on an already tall telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe dolly weighs 30.0 lb\u003c\/strong\u003e on its own, before the telescope is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 350 and 400 share a published footprint and board range.\u003c\/strong\u003e JMI lists the same 33″ × 53″ frame and 28″–32″ board range for both, with the stated aperture class being the difference — we are glad to sort out which model suits your telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe dolly is a welded steel frame, so setup means placing the Dobsonian's ground board onto it, winding the leveling bolts until the base sits flat, and locking the wheels once the telescope is where you want it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know whether my Dob fits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBy the outside diameter of its ground board, specified at 28″ to 32″ for this model. The Meade LightBridge 16″ and the Orion SkyQuest XX12g, XX14g and XX14i are named fits, and we are glad to check any other telescope against that range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the tow handle do?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt lets the loaded frame be pulled and steered from the front, which gives more control over a tall, heavy telescope than pushing it from behind.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it differ from the Sky Trekker 350?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJMI publishes the same 33″ × 53″ frame and 28″–32″ ground board range for both, and specifies the 350 for the 12″ to 14″ class and the 400 for the 14″ to 16″ class. Where a telescope sits near that boundary, we are happy to work it out with you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there wheel options to choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Four 10″ pneumatic all-terrain tires are standard on this model, so there is no wheel upgrade to add.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the telescope stay on it between sessions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt can, and on a Dob of this size that is the usual arrangement, since it removes the rocker box lift from the session entirely.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Sky Trekker 400 is the Dobsonian dolly for the 14″ to 16″ class — a 33″ × 53″ welded steel frame on four 10″ pneumatic all-terrain tires with a tow handle, 4″ to 5″ of lift, locking wheels and leveling bolts, at 30.0 lb and built by JMI in the USA. Fit comes down to a ground board of 28″ to 32″ outside diameter, and we will happily check that figure with you.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296860987503,"sku":"TPWST400","price":846.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/wheeley-bars-4_018f46e4-bea0-4fd2-9c9e-87a9e5e3246d.jpg?v=1781714343"},{"product_id":"jmi-triangle-style-wheeley-bar-dobsonian-dolly-for-8-10-12-telescopes","title":"JMI Triangle-Style Wheeley Bar — Dobsonian Dolly for 8″, 10″ \u0026 12″ Telescopes","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Triangle-Style Wheeley Bar is a Dobsonian dolly built as a welded steel triangle, open at the centre, with a locking caster at each of its three points. It carries the ground board of an 8″, 10″ or 12″ Dobsonian and rolls the assembled telescope out to the observing spot in one piece. The frame accepts a centre-of-foot to centre-of-foot span of 12.21″ to 20.87″ (310 to 530 mm), which is the measurement that settles fit. JMI builds it in the USA, and the vendor lists it at 20.0 lb.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you keep an 8″, 10″ or 12″ Dobsonian assembled indoors, in a garage or in a shed, and your observing spot is a driveway, patio or garage apron a short roll away. The three-point triangle is the lighter and simpler end of the JMI dolly range, so it suits a flat, hard route out rather than a long haul over rough ground.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriangular welded steel frame:\u003c\/strong\u003e Three-point layout, open through the centre, matching the three feet under a Dobsonian ground board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne locking caster per point:\u003c\/strong\u003e A caster at each corner of the triangle, each one lockable at the observing position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide fit range:\u003c\/strong\u003e Accepts a foot spacing of 12.21″ to 20.87″ (310 to 530 mm) centre-of-foot to centre-of-foot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCovers three popular apertures:\u003c\/strong\u003e Specified by JMI for 8″, 10″ and 12″ Dobsonian telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublished caster options:\u003c\/strong\u003e JMI lists 2.5″ locking casters as the standard fitment, and a 5″ locking caster set as a separate upgrade that raises the mount 6-3\/8″ off the ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeveling screws available separately:\u003c\/strong\u003e JMI publishes a leveling screw and hardware set as its own add-on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt in the USA:\u003c\/strong\u003e Manufactured by JMI.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA Dobsonian ground board stands on three feet, and this frame answers that directly: a steel triangle with a caster under each point, so each foot of the telescope loads a corner of the frame rather than sitting on a rectangular platform that has to be sized to the board's diameter. Leaving the centre open keeps the steel out from under the azimuth bearing and keeps the weight down. Because the geometry is set by where the feet land rather than how wide the board is, one frame covers a span from 12.21″ to 20.87″ — which is how the same dolly takes an 8″ Dob and a 12″ Dob. The caster choice sets ride height: the 2.5″ standard casters keep the telescope low and the eyepiece close to its usual height, while the 5″ set raises the mount 6-3\/8″ off the ground and clears more of what is underneath it.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRolling an assembled 8″, 10″ or 12″ Dobsonian from a garage out onto a driveway or apron\u003c\/li\u003e\n\u003cli\u003eShed-to-patio and indoor-to-deck roll-outs over a short, flat, hard route\u003c\/li\u003e\n\u003cli\u003eKeeping a medium Dob on its dolly between sessions so the rocker box is not lifted\u003c\/li\u003e\n\u003cli\u003eRepositioning the telescope on a paved surface during the night to clear an obstruction\u003c\/li\u003e\n\u003cli\u003eStoring a Dobsonian assembled rather than separating the tube and rocker box each session\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe triangle frame is specified by JMI for Dobsonian telescopes in the 8″, 10″ and 12″ classes, with fit decided by the centre-of-foot to centre-of-foot distance under the ground board — the straight-line distance between any two of the three feet — which falls between 12.21″ and 20.87″ (310 to 530 mm). That measurement, rather than the aperture on the tube, is what determines whether a given Dob sits on this frame. JMI also publishes two separate add-ons for it: a 5″ locking caster set that raises the mount 6-3\/8″ off the ground, and a leveling screw and hardware set. This frame carries a Dobsonian ground board; tripod-mounted telescopes and equatorial mounts are served by the Universal Wheeley Bars, and larger Dobsonians by the Sky Trekker range. Tell us your telescope model, the distance between two of its feet, and which caster height suits your setup, and we'll confirm the fit and the configuration before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit is set by foot spacing, not aperture.\u003c\/strong\u003e The published span is 12.21″ to 20.87″ (310 to 530 mm) centre-of-foot to centre-of-foot, and a Dob outside that range sits outside the published fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaster size is a configuration choice.\u003c\/strong\u003e JMI lists 2.5″ locking casters as standard and a 5″ locking caster set as a separate upgrade — we are glad to confirm which casters are on the unit you are looking at.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeveling screws are a separate item.\u003c\/strong\u003e JMI publishes them as their own add-on rather than as part of the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe casters suit hard, flat surfaces.\u003c\/strong\u003e Garage floors, paved driveways and patios are the surfaces this frame is built around; rough ground, gravel, grass and stairs are where the pneumatic-tired Sky Trekker models earn their keep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a manual dolly.\u003c\/strong\u003e It rolls under hand power; the motorized drive unit is a separate product built for the Heavy-Duty Universal Wheeley Bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe vendor lists the frame at 20.0 lb\u003c\/strong\u003e on its own, before the telescope is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarger Dobsonians have their own models.\u003c\/strong\u003e The Sky Trekker 300, 350 and 400 cover apertures above this frame's range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe frame is welded steel, so setting up means lowering the Dobsonian's ground board onto the triangle with each of its three feet over a corner, and locking the casters once the telescope is positioned.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is cof-to-cof distance, and how do I measure it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt stands for centre-of-foot to centre-of-foot — the straight-line distance between any two of the three feet on the bottom of your Dobsonian's ground board. For this frame that figure falls between 12.21″ and 20.87″.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich casters does it use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJMI publishes 2.5″ locking casters as the standard fitment, with a 5″ locking caster set offered separately that raises the mount 6-3\/8″ off the ground. We are happy to confirm the caster configuration on a given unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it work with a tripod-mounted telescope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe triangle is shaped around a Dobsonian ground board and its three feet. Tripod-mounted telescopes and equatorial mounts are covered by the Universal Wheeley Bars instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat surfaces does it suit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHard, flat, smooth ones — garage floors, paved driveways and patios. For grass, gravel and uneven ground, the Sky Trekker models ride on 10″ pneumatic tires.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen would a Sky Trekker suit better?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor Dobsonians larger than the 12″ class, for a route that crosses rough ground, or where more ground clearance is wanted than a caster provides.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Triangle-Style Wheeley Bar is the simple, light Dobsonian dolly in the JMI range — a welded steel triangle with a locking caster at each point, taking a foot spacing of 12.21″ to 20.87″ across the 8″, 10″ and 12″ classes, listed at 20.0 lb and made in the USA. Tell us the distance between two of your ground board's feet and we will happily match it for you.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296896999535,"sku":"TPWTRI","price":349.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TPWTD12-8.webp?v=1781725212"},{"product_id":"jmi-ez-glide-wheeley-kit-universal-dobsonian-telescope-mobility-upgrade","title":"JMI Ez-Glide Wheeley Kit — Universal Dobsonian Telescope Mobility Upgrade","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe JMI Ez-Glide Wheeley Kit puts casters on the Dobsonian itself rather than on a platform the scope has to be lifted onto. Three steel mounting plates bolt to the underside of the ground board and carry three 5″ Total Lock polyurethane casters, so the assembled telescope rolls from storage to the observing spot in one piece. The install also lifts the base about 7″, which raises the eyepiece by roughly the same amount. The kit is made in the USA by JMI.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It’s For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you…\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003estore a wooden-base Dobsonian indoors and roll it out to a driveway, patio or garage apron\u003c\/li\u003e\n\u003cli\u003ewould rather not lift or disassemble an 8″ to 12″ Dob for every session\u003c\/li\u003e\n\u003cli\u003ewant the eyepiece to sit about 7″ higher without changing the optical tube or base\u003c\/li\u003e\n\u003cli\u003eprefer a one-time permanent upgrade to a separate dolly that has to be stored alongside the scope\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree 5″ Total Lock casters:\u003c\/strong\u003e a single lever locks both wheel rotation and swivel, so the base sits rigid once it is parked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel mounting plates:\u003c\/strong\u003e high tensile strength steel, roughly 2.7× stiffer than aluminum at the same weight, which keeps flex and vibration out of the tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePowder-coat finish:\u003c\/strong\u003e UV-stable textured black powder coat on the plates for outdoor use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple hole patterns:\u003c\/strong\u003e the plates carry several bolt patterns matched to the common GSO and Synta ground board layouts, so one kit spans many brands and apertures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete fastener set:\u003c\/strong\u003e self-tapping screws for the ground board and 1\/4″-20 cap screws for the casters are included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo hand tools:\u003c\/strong\u003e a Phillips screwdriver and a 7\/16″ wrench cover the whole installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eEach caster carries its load through a steel plate rather than directly through the wood of the ground board, which spreads the point load across the board and keeps the fastener heads from working loose. The Total Lock mechanism is the part that matters at the eyepiece: an ordinary caster brake stops the wheel but leaves the swivel free, so the base can still pivot under a hand on the tube. Locking the swivel as well removes that degree of freedom, which is what makes the kit usable at high magnification and for imaging from a fixed position. Polyurethane treads are chosen for hard surfaces — they roll quietly on concrete and do not mark floors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMoving a fully assembled Dobsonian from a garage or basement to a paved observing spot\u003c\/li\u003e\n\u003cli\u003eRepositioning the scope during a session to follow a target past a roofline or tree\u003c\/li\u003e\n\u003cli\u003ePublic outreach and club nights on concrete pads, school lots and paved paths\u003c\/li\u003e\n\u003cli\u003eHigh-magnification lunar and planetary work, with all three casters locked\u003c\/li\u003e\n\u003cli\u003eRaising the eyepiece to a more comfortable standing or seated height on shorter Dobs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Ez-Glide is built around the GSO and Synta ground board layouts, which covers most wooden-base Dobsonians sold today: Apertura AD series, Zhumell Z8, Z10 and Z12, Celestron Dobsonians including the StarSense Explorer models, Sky-Watcher Classic and Traditional Dobsonians, Orion SkyQuest and XT series, Meade LightBridge, and Antares Dobsonians. The requirement is a wooden ground board with the standard three-foot layout; metal or non-standard ground boards fall outside that pattern. Scopes that sit on a separate wheeled platform instead — encoder-equipped Dobs, or observers working on grass and gravel — are served by the Sky Trekker and Triangle Style Wheeley Bars rather than by this kit. If you are unsure which category your scope falls into, send us the model name and we will check it for you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe kit is a permanent upgrade.\u003c\/strong\u003e The plates attach with self-tapping screws into the underside of the ground board. They can be backed out later, leaving small screw holes on a surface that is not visible in normal use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolyurethane casters suit hard, smooth ground.\u003c\/strong\u003e Concrete, garage floors, pavement and indoor flooring roll well. Lawn, gravel, dirt and rough terrain are where 10″ pneumatic tires on the Sky Trekker series do better.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation takes most observers under an hour.\u003c\/strong\u003e It is a bolt-and-screw job with two hand tools and no drilling of the optical tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe eyepiece height gain is approximately 7″.\u003c\/strong\u003e The exact figure varies with the height of the original feet on a given base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight is 40 lb.\u003c\/strong\u003e The kit ships as steel plates and casters, so the carton is heavier than its size suggests.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to install?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is a straightforward home installation. Three plates go onto the underside of the ground board with the included self-tapping screws using a Phillips screwdriver, and each caster bolts to its plate with the included 1\/4″-20 cap screws using a 7\/16″ wrench. Most observers finish in under an hour.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my Dobsonian?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIf the ground board is wood and uses the standard three-foot layout, the answer is almost always yes — the plates carry several hole patterns covering the GSO and Synta-built bases. Metal or non-standard ground boards are the exception, and we are glad to check a specific model for you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from a Wheeley Bar?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Ez-Glide bolts wheels onto the scope, so the wheels become part of the telescope. A Wheeley Bar is a separate wheeled platform that the assembled scope stands on. The Ez-Glide is the lower-cost route and adds about 7″ of eyepiece height; the Sky Trekker platforms add 10″ pneumatic tires and leveling screws instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does Total Lock mean?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOne lever locks the wheel and the swivel at the same time. A plain caster brake only stops the wheel turning and leaves the caster free to pivot, which lets the base shift under hand pressure at the focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the casters roll on grass?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey are designed for hard, smooth surfaces. On lawn, gravel or dirt the 5″ polyurethane treads dig in and catch on irregularities, and pneumatic-tired platforms handle that ground far better.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy steel plates rather than aluminum?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh tensile strength steel is about 2.7× stiffer than aluminum at the same weight. The extra stiffness keeps flex and vibration from travelling up into the optical tube, which shows most at high power and whenever a hand is on the focuser.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the Ez-Glide turns a wooden-base Dobsonian into a rolling telescope with three 5″ Total Lock casters and three steel plates, gains about 7″ of eyepiece height in the process, and installs in under an hour with a screwdriver and a 7\/16″ wrench.\u003c\/p\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":53296897163375,"sku":"TPWEZG","price":238.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/doublebattery-1_91b73273-7544-44af-a723-3b37b9e330a6.jpg?v=1781714383"}],"url":"https:\/\/ontariotelescope.com\/collections\/jmi-dobsonian-wheeley-bars.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}