{"product_id":"jmi-10-inch-pneumatic-large-wheel-upgrade-universal-style-wheeley-bars-with-5-8-leveling-screws","title":"JMI 10 Inch Pneumatic Large Wheel Upgrade - Universal Style Wheeley Bars with 5\/8\" Leveling Screws","description":"\u003c!--FPSEO|v1|20260528|111111111110001010--\u003e\n\u003cstyle\u003e\n.fp-wbp{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,\"Helvetica Neue\",Arial,sans-serif;line-height:1.6;color:#2a2a2a;max-width:900px;}\n.fp-wbp *{box-sizing:border-box;}\n.fp-wbp h2{font-size:1.45em;font-weight:700;color:#0d1333;margin:30px 0 12px;line-height:1.25;}\n.fp-wbp p{margin:0 0 14px;}\n.fp-wbp a{color:#b8862a;font-weight:600;text-decoration:none;}\n.fp-wbp a:hover{text-decoration:underline;}\n.fp-wbp strong{color:#0d1333;}\n.fp-wbp .badge{display:inline-block;background:#0d1333;color:#c9a84c;padding:5px 14px;border-radius:20px;font-size:0.76em;font-weight:700;letter-spacing:0.07em;text-transform:uppercase;margin-bottom:14px;}\n.fp-wbp .lead{font-size:1.15em;color:#0d1333;font-weight:600;margin-bottom:10px;}\n.fp-wbp .specs{border:1px solid #e0ddd4;border-radius:10px;overflow:hidden;margin:18px 0;}\n.fp-wbp .specs .row{display:flex;border-top:1px solid #ece9e1;}\n.fp-wbp .specs .row:first-child{border-top:0;}\n.fp-wbp .specs .k{flex:0 0 42%;background:#f9f7f1;padding:12px 16px;font-weight:700;color:#0d1333;font-size:0.9em;}\n.fp-wbp .specs .v{flex:1;padding:12px 16px;font-size:0.9em;}\n.fp-wbp .callout{background:#fffbed;border:1px solid #e6c878;border-left:5px solid #b8862a;border-radius:8px;padding:16px 20px;margin:18px 0;font-size:0.95em;}\n.fp-wbp .callout strong{color:#6a4f12;}\n.fp-wbp details{background:#fafafa;border:1px solid #e6e4dd;border-radius:6px;margin-bottom:10px;}\n.fp-wbp details[open]{border-color:#b8862a;background:#fff;}\n.fp-wbp summary{cursor:pointer;padding:14px 50px 14px 18px;font-weight:600;color:#0d1333;list-style:none;position:relative;}\n.fp-wbp summary::-webkit-details-marker{display:none;}\n.fp-wbp summary::after{content:'+';position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.4em;color:#b8862a;font-weight:400;}\n.fp-wbp details[open] summary::after{content:'\\2212';}\n.fp-wbp .faq-body{padding:0 18px 16px;font-size:0.95em;}\n.fp-wbp .faq-body p{margin:0 0 10px;}\n.fp-wbp .faq-body p:last-child{margin:0;}\n.fp-wbp .cta{background:linear-gradient(135deg,#0d1333,#1a1f3d);color:#fff;border-radius:10px;padding:22px 24px;margin-top:26px;}\n.fp-wbp .cta h3{color:#fff;margin-bottom:6px;font-size:1.1em;}\n.fp-wbp .cta p{color:rgba(255,255,255,0.85);margin-bottom:14px;font-size:0.95em;}\n.fp-wbp .cta a{display:inline-block;background:#c9a84c;color:#0d1333;padding:10px 22px;border-radius:5px;font-weight:700;margin:4px 8px 4px 0;}\n.fp-wbp .cta a:hover{background:#d4b75c;text-decoration:none;}\n@media(max-width:600px){.fp-wbp .specs .row{flex-direction:column;}.fp-wbp .specs .k{flex:none;}}\n\u003c\/style\u003e\n\n\u003cdiv class=\"fp-wbp\"\u003e\n\n\u003cspan class=\"badge\"\u003e10″ Pneumatic Wheel Upgrade · 5\/8″ Leveling Screws\u003c\/span\u003e\n\u003cp class=\"lead\"\u003eRoll your loaded HD Wheeley Bar over grass, gravel, dirt, or rough pavement — six 10″ all-terrain pneumatic wheels replace the standard 2⅜″ casters.\u003c\/p\u003e\n\n\u003cp\u003eThe factory 2⅜″ hard-rubber casters that ship with the JMI Wheeley Bar work great on smooth driveways and garage floors, but they fight you on grass, gravel, mulch, sand, or anywhere the surface isn't paved. The \u003cstrong\u003e10″ Pneumatic Large Wheel Upgrade\u003c\/strong\u003e replaces those small casters with six 10″ all-terrain pneumatic wheels — the same tire profile you'd find on a serious garden cart — plus a tow handle for easy pulling. Once installed, your bar rolls over almost anything without skidding, sinking, or yanking your shoulder.\u003c\/p\u003e\n\n\u003cp\u003eThis is the \u003cstrong\u003e5\/8″ version\u003c\/strong\u003e — sized for current heavy-duty Wheeley Bars with 5\/8″ leveling screws (\u003ca href=\"\/products\/jmi-heavy-duty-medium-size-universal-wheeley-bar-telescope-dolly-1\"\u003eHD Medium\u003c\/a\u003e, \u003ca href=\"\/products\/jmi-heavy-duty-large-size-universal-wheeley-bar-telescope-transport-dolly\"\u003eHD Large\u003c\/a\u003e, \u003ca href=\"\/products\/jmi-heavy-duty-shorty-universal-wheeley-bar-telescope-dolly\"\u003eHD Shorty\u003c\/a\u003e). The tow handle bracket included in this upgrade is sized for the 5\/8″ HD frame. For Standard Medium or older HD models with 1\/2″ leveling screws, see the \u003ca href=\"\/products\/jmi-10-inch-pneumatic-large-wheel-upgrade-universal-style-wheeley-bars\"\u003e1\/2″ version\u003c\/a\u003e. Made in the USA by JMI, part of the CXB Astro family.\u003c\/p\u003e\n\n\u003cdiv class=\"callout\"\u003e\n\u003cstrong\u003ePurchase-time upgrade pricing.\u003c\/strong\u003e This $364 price assumes JMI is swapping the factory casters for the 10″ wheels before shipping your new Wheeley Bar — you pay the difference between the casters and the wheels, not the full retail price of the wheels. For an already-owned bar, see \"Upgrading an existing bar?\" below.\n\u003c\/div\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eWhat's included\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eSix (6) 10″ all-terrain pneumatic wheels (2 front swivel casters + 4 rear in dual-inboard pairs) · tow handle assembly with 5\/8″-compatible bracket · all mounting hardware\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eReplaces\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eFactory 2⅜″ hard-rubber casters and the bar's standard wheel hardware\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eWheel configuration\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eDual inboard rear wheels (4 wheels in pairs) keep the bar's track width narrow despite the larger wheel diameter · 2 front swivel casters for maneuverability\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eRide height change\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eRaises the mounted scope approximately 3¼″ off the ground vs. the factory caster setup\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eDesigned for\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eJMI HD Wheeley Bars with 5\/8″ leveling screws — current \u003ca href=\"\/products\/jmi-heavy-duty-medium-size-universal-wheeley-bar-telescope-dolly-1\"\u003eHD Medium\u003c\/a\u003e, \u003ca href=\"\/products\/jmi-heavy-duty-large-size-universal-wheeley-bar-telescope-transport-dolly\"\u003eHD Large\u003c\/a\u003e, and \u003ca href=\"\/products\/jmi-heavy-duty-shorty-universal-wheeley-bar-telescope-dolly\"\u003eHD Shorty\u003c\/a\u003e models\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eBest for\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eGrass, gravel, mulch, sand, rough pavement, lawn-to-driveway transitions — anywhere the factory casters would skid, stick, or sink\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eTow handle status\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eTow handle is \u003cstrong\u003eincluded\u003c\/strong\u003e with this upgrade — no need to add the standalone \u003ca href=\"\/products\/jmi-tow-handle-universal-style-wheeley-bars-package\"\u003e5\/8″ Tow Handle\u003c\/a\u003e separately\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eNOT compatible with\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eWheeley Bars with 1\/2″ leveling screws (Standard Medium and older HD — different tow handle bracket) · Triangle Style · Sky Trekker series\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"k\"\u003eMade in\u003c\/div\u003e\n\u003cdiv class=\"v\"\u003eUSA by JMI · part of the CXB Astro family\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy Pneumatic 10″ Wheels?\u003c\/h2\u003e\n\u003cp\u003eThe biggest practical difference between rolling on 2⅜″ casters and 10″ pneumatic wheels is whether the wheel \u003cem\u003ecuts into\u003c\/em\u003e the surface or \u003cem\u003erides over\u003c\/em\u003e it. A small caster's contact patch is barely larger than a quarter — it digs in on grass, jams in gravel, and stops dead on the first stick or rock. A 10″ pneumatic wheel has a 2–3 inch contact patch with give from the air pressure — it rolls over what a caster catches on. The cumulative effect: less stalling, less yanking, less risk to your mount when you hit something you didn't see in the dark.\u003c\/p\u003e\n\n\u003ch2\u003eUpgrading an Existing Bar?\u003c\/h2\u003e\n\u003cp\u003eThis SKU is priced for purchase-time installation by JMI. If you've already taken delivery of your HD Wheeley Bar and want to add the 10″ wheels later, an aftermarket path exists: JMI can sell you the wheels, bracket, and tow handle separately for self-installation — but only if your current wheels are \u003cstrong\u003ebolt-attached\u003c\/strong\u003e (current manufacturing method). Very old bars with rivet-attached wheels can't be retrofitted. Email \u003ca href=\"mailto:support@cxbastro.com\"\u003esupport@cxbastro.com\u003c\/a\u003e with your bar's age and a photo of the wheel mount; we'll confirm whether you qualify and quote aftermarket pricing. (Aftermarket pricing is higher than $364 because there's no caster \"trade-in,\" and JMI doesn't accept returns of used factory casters.)\u003c\/p\u003e\n\n\u003ch2\u003e1\/2″ Leveling Screws Instead?\u003c\/h2\u003e\n\u003cp\u003eIf your Wheeley Bar uses 1\/2″ leveling screws — Standard Medium, or older HD Medium \/ HD Large models — order the \u003ca href=\"\/products\/jmi-10-inch-pneumatic-large-wheel-upgrade-universal-style-wheeley-bars\"\u003e1\/2″ 10″ Pneumatic Wheel Upgrade\u003c\/a\u003e instead. Same price ($364), same six wheels and tow handle, but with a tow handle bracket sized for the 1\/2″ frame.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\u003csummary\u003eHow do I know if my Wheeley Bar has 1\/2″ or 5\/8″ leveling screws?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003ePull one leveling screw out and measure the thread diameter with calipers or a ruler. 5\/8″ is the current HD standard — newer HD Medium, HD Large, and HD Shorty bars. 1\/2″ is the older standard — Standard Medium and earlier HD model years. If still unsure, email \u003ca href=\"mailto:support@cxbastro.com\"\u003esupport@cxbastro.com\u003c\/a\u003e with a photo of your bar.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eDoes this upgrade fit the HD Shorty Wheeley Bar?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003eYes — the HD Shorty uses 5\/8″ leveling screws, which is the right size for this upgrade. The Shorty's compact frame doesn't affect compatibility; the 10″ wheels and tow handle bracket bolt up the same way as on HD Medium and HD Large bars.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eWhat does \"purchase-time upgrade\" mean? Can I order this for a bar I already own?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003eThe $364 price assumes JMI is swapping the factory casters for the 10″ wheels before shipping your new bar — the small casters are essentially \"traded in\" toward the larger wheels. For already-owned bars, JMI can sell the wheels, bracket, and tow handle as an aftermarket kit for self-install (bolt-attached wheels only — very old riveted bars can't be retrofitted). Email \u003ca href=\"mailto:support@cxbastro.com\"\u003esupport@cxbastro.com\u003c\/a\u003e for aftermarket pricing and to confirm your bar's eligibility.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eWhy six wheels instead of four?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003eThe rear axle uses a dual inboard wheel design — two pairs of wheels on the rear instead of one wheel per side. That keeps overall track width narrow (so the bar still fits through doors and tight setup spots) while doubling the rear contact patch for stability under a heavy mount. Front gets two single swivel casters. Total: 6 pneumatic wheels.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs the tow handle included with this upgrade?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003eYes — a tow handle is included as part of the 10″ wheel upgrade. You do \u003cem\u003enot\u003c\/em\u003e need to add the standalone \u003ca href=\"\/products\/jmi-tow-handle-universal-style-wheeley-bars-package\"\u003e5\/8″ Tow Handle\u003c\/a\u003e product when you order this upgrade. If you want a \u003cem\u003elonger\u003c\/em\u003e handle (12″ longer than standard), the \u003ca href=\"\/products\/tow-handle-xl-longer-tow-handle-upgrade\"\u003eTow Handle XL\u003c\/a\u003e upgrade still applies and is sold separately.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdetails\u003e\u003csummary\u003eHow much higher does the bar sit with 10″ wheels?\u003c\/summary\u003e\n\u003cdiv class=\"faq-body\"\u003e\u003cp\u003eAbout 3¼″ higher than with the factory 2⅜″ casters. Worth knowing if you're sensitive to total observing height — most observers find the extra height welcome (fewer back-bends at the eyepiece), but if you're already at the upper end of your scope's comfortable eyepiece reach, factor it in.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003cdiv class=\"cta\"\u003e\n\u003ch3\u003eOrdering a fresh HD Wheeley Bar?\u003c\/h3\u003e\n\u003cp\u003eAdd the 10″ Pneumatic upgrade and let JMI install before shipping. Already own one? Email support for aftermarket pricing.\u003c\/p\u003e\n\u003ca href=\"\/collections\/wheeley-bars\"\u003eShop Wheeley Bars\u003c\/a\u003e\n\u003ca href=\"\/collections\/wheeley-bar-accessories-1\"\u003eShop accessories\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"How do I know if my Wheeley Bar has 1\/2 inch or 5\/8 inch leveling screws?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Pull one leveling screw out and measure the thread diameter. 5\/8 inch is the current HD standard, used on newer HD Medium, HD Large, and HD Shorty bars. 1\/2 inch is the older standard, used on Standard Medium bars and earlier HD model years.\"}},\n    {\"@type\":\"Question\",\"name\":\"Does the 5\/8 inch 10 inch wheel upgrade fit the JMI HD Shorty Wheeley Bar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The HD Shorty uses 5\/8 inch leveling screws, which is the right size for this upgrade. The Shorty's compact frame does not affect compatibility; the 10 inch wheels and tow handle bracket bolt up the same way as on HD Medium and HD Large bars.\"}},\n    {\"@type\":\"Question\",\"name\":\"What does purchase-time upgrade mean and can the 10 inch wheel upgrade be ordered for a bar already owned?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 364 dollar price assumes JMI is swapping the factory casters for the 10 inch wheels before shipping the new bar. For already-owned bars, JMI can sell the wheels, bracket, and tow handle as an aftermarket kit for self-install, but only if the current wheels are bolt-attached. Very old riveted bars cannot be retrofitted. Email support@cxbastro.com for aftermarket pricing.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why does the 10 inch wheel upgrade include six wheels instead of four?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The rear axle uses a dual inboard wheel design with two pairs of wheels on the rear instead of one wheel per side. That keeps overall track width narrow while doubling the rear contact patch for stability under a heavy mount. Front gets two single swivel casters.\"}},\n    {\"@type\":\"Question\",\"name\":\"Is the tow handle included with the 10 inch wheel upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a tow handle is included as part of the 10 inch wheel upgrade. The standalone 5\/8 inch Tow Handle product does not need to be added separately. The Tow Handle XL longer-handle upgrade is still sold separately.\"}},\n    {\"@type\":\"Question\",\"name\":\"How much higher does the bar sit with 10 inch pneumatic wheels?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"About 3 and 1\/4 inches higher than with the factory 2 and 3\/8 inch casters. Most observers find the extra height welcome since it requires fewer back-bends at the eyepiece.\"}}\n  ]\n}\n\u003c\/script\u003e","brand":"JMI","offers":[{"title":"Default Title","offer_id":40584745156761,"sku":"TPW10UPG-5\/8\"","price":364.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/6639\/8617\/products\/tpw_lw10upg-1_08c96c10-9e0e-4ec8-96e2-46ffb7d7ee3d.jpg?v=1775145694","url":"https:\/\/farpointastro.com\/products\/jmi-10-inch-pneumatic-large-wheel-upgrade-universal-style-wheeley-bars-with-5-8-leveling-screws","provider":"FarpointAstro","version":"1.0","type":"link"}