{"product_id":"bow-roller-assembly-fits-multiple-trailer-brands-with-1-2-shaft-replaces-gl-ckmarine-markgoo","title":"Bow Roller Assembly – Fits Multiple Trailer Brands with 1\/2\" Shaft (Replaces GlückMarine, MARKGOO)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis is a versatile \u003cstrong\u003e7\" X 4\" Boat Trailer Roller Assembly with 1\/2 Inch Shaft Bow Stop\u003c\/strong\u003e designed for boat trailers with 1\/2 inch mounting shafts. Constructed from durable, non-marking polyurethane, it provides gentle yet firm support for your boat's bow, preventing hull damage during loading and trailering.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for GlückMarine, MARKGOO, and JFATXTT 7-inch by 4-inch bow rollers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Simple bolt-on process using a 1\/2\" shaft (not included).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Benefits:\u003c\/strong\u003e Highly resistant to sunlight, chemicals, and water for long-lasting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface:\u003c\/strong\u003e Smooth, non-marking polyurethane protects your boat's hull from scuffs and scratches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGlückMarine\u003c\/td\u003e\n        \u003ctd\u003eReplaces 7\" X 4\" Bow Roller Assembly\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMARKGOO\u003c\/td\u003e\n        \u003ctd\u003eReplaces 7\" X 4\" Boat Trailer Roller\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJFATXTT\u003c\/td\u003e\n        \u003ctd\u003eReplaces 4\" Bow Roller\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eApplication\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMultiple Brands\u003c\/td\u003e\n        \u003ctd\u003eBoat trailers with 1\/2 inch mounting shafts\u003c\/td\u003e\n        \u003ctd\u003eProvides resilient support for boat's keel\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eBow Roller Assembly\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eBolt-on (1\/2 inch shaft)\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003ePolyurethane (PU)\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n\u003cdd\u003eBlue (also available in Black)\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e7\" L x 4\" W (177.8 mm x 101.6 mm)\u003c\/dd\u003e\n  \u003cdt\u003eCenter Hole Diameter\u003c\/dt\u003e\n\u003cdd\u003e17 mm (0.67 in)\u003c\/dd\u003e\n  \u003cdt\u003eShaft Size\u003c\/dt\u003e\n\u003cdd\u003e1\/2 inch (12.7 mm)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.94 kg (2.07 lb)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eNon-marking surface prevents boat hull damage\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Boat Keel Roller (7\" x 4\" with 1\/2\" shaft hole)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the trailer is on a level, stable surface and the boat is properly secured or removed.\u003c\/li\u003e\n  \u003cli\u003eLoosen and remove the nut and bolt from the existing bow stop shaft.\u003c\/li\u003e\n  \u003cli\u003eSlide the old roller off the shaft. Clean any dirt or corrosion from the mounting brackets and shaft.\u003c\/li\u003e\n  \u003cli\u003eAlign the new polyurethane roller with the mounting brackets.\u003c\/li\u003e\n  \u003cli\u003eSlide the 1\/2-inch shaft through the bracket, the new roller, and the opposite bracket.\u003c\/li\u003e\n  \u003cli\u003eSecure the assembly by reinstalling the washer and nut. Tighten until snug, ensuring the roller can still spin freely.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this roller will fit my trailer?\u003c\/summary\u003e\u003cp\u003eThis roller is designed for a universal fit on boat trailers with a 1\/2-inch diameter mounting shaft for the bow stop. Please measure your existing roller and shaft diameter to confirm compatibility. The key dimensions are a 7-inch length, 4-inch width, and a 1\/2-inch (or 17mm) center hole.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat's the difference between this polyurethane roller and a standard rubber one?\u003c\/summary\u003e\u003cp\u003ePolyurethane (PU) rollers are significantly more durable and resistant to UV rays, oils, and gasoline than traditional black rubber rollers. They are also non-marking, meaning they won't leave black scuffs or scratches on your boat's hull.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhen should I replace my bow roller?\u003c\/summary\u003e\u003cp\u003eReplace your roller if you see signs of degradation such as cracking, splitting, flat spots, or excessive wear. A worn roller can fail to support the boat correctly and may damage the hull.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the mounting shaft or hardware included?\u003c\/summary\u003e\u003cp\u003eThis package includes the roller only. The 1\/2-inch shaft, bolts, and nuts are not included and should be reused from your existing setup or purchased separately.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan this roller be fully submerged in saltwater?\u003c\/summary\u003e\u003cp\u003eYes, the polyurethane material is highly resistant to both freshwater and saltwater, as well as common marine chemicals, making it ideal for all environments.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing bow roller?\u003c\/summary\u003e\u003cp\u003eCommon failure signs include visible cracks, deep gouges, a lopsided or deformed shape, or the roller seizing and failing to spin freely as the boat is loaded.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717892575547,"sku":"4Inch-Black-W","price":25.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/4Inch-Black-W.png?v=1762937566","url":"https:\/\/seasierra.com\/products\/bow-roller-assembly-fits-multiple-trailer-brands-with-1-2-shaft-replaces-gl-ckmarine-markgoo","provider":"SeaSierra","version":"1.0","type":"link"}