Bow Roller Assembly – Fits Multiple Trailer Brands with 1/2" Shaft (Replaces GlückMarine, MARKGOO)
Bow Roller Assembly – Fits Multiple Trailer Brands with 1/2" Shaft (Replaces GlückMarine, MARKGOO) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Bow Roller Assembly – Fits Multiple Trailer Brands with 1/2" S...
Bow Roller Assembly – Fits Multiple Trailer Brands with 1/2" Shaft (Replaces GlückMarine, MARKGOO) is backordered and will ship as soon as it is back in stock.
Product Details
This is a versatile 7" X 4" Boat Trailer Roller Assembly with 1/2 Inch Shaft Bow Stop 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.
It serves as a direct replacement for GlückMarine, MARKGOO, and JFATXTT 7-inch by 4-inch bow rollers.
- Installation Method: Simple bolt-on process using a 1/2" shaft (not included).
- Material Benefits: Highly resistant to sunlight, chemicals, and water for long-lasting performance.
- Surface: Smooth, non-marking polyurethane protects your boat's hull from scuffs and scratches.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Notes |
|---|---|
| GlückMarine | Replaces 7" X 4" Bow Roller Assembly |
| MARKGOO | Replaces 7" X 4" Boat Trailer Roller |
| JFATXTT | Replaces 4" Bow Roller |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Application | Notes |
|---|---|---|
| Multiple Brands | Boat trailers with 1/2 inch mounting shafts | Provides resilient support for boat's keel |
Technical Specs
- Product Type
- Bow Roller Assembly
- Installation
- Bolt-on (1/2 inch shaft)
- Material
- Polyurethane (PU)
- Color
- Blue (also available in Black)
- Dimensions
- 7" L x 4" W (177.8 mm x 101.6 mm)
- Center Hole Diameter
- 17 mm (0.67 in)
- Shaft Size
- 1/2 inch (12.7 mm)
- Weight
- 0.94 kg (2.07 lb)
- Other Technical Attributes
- Non-marking surface prevents boat hull damage
What’s in the Box
- 1 x Boat Keel Roller (7" x 4" with 1/2" shaft hole)
Installation Notes
- Ensure the trailer is on a level, stable surface and the boat is properly secured or removed.
- Loosen and remove the nut and bolt from the existing bow stop shaft.
- Slide the old roller off the shaft. Clean any dirt or corrosion from the mounting brackets and shaft.
- Align the new polyurethane roller with the mounting brackets.
- Slide the 1/2-inch shaft through the bracket, the new roller, and the opposite bracket.
- Secure the assembly by reinstalling the washer and nut. Tighten until snug, ensuring the roller can still spin freely.
Troubleshooting & FAQ
How do I know if this roller will fit my trailer?
This 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.
What's the difference between this polyurethane roller and a standard rubber one?
Polyurethane (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.
When should I replace my bow roller?
Replace 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.
Is the mounting shaft or hardware included?
This 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.
Can this roller be fully submerged in saltwater?
Yes, the polyurethane material is highly resistant to both freshwater and saltwater, as well as common marine chemicals, making it ideal for all environments.
What are the signs of a failing bow roller?
Common 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.
OEM vs. Aftermarket?
This 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.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered 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 & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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