Bow Roller – Fits Multiple Trailer Brands (Replaces GlückMarine, MARKGOO, JFATXTT)
Bow Roller – Fits Multiple Trailer Brands (Replaces GlückMarine, MARKGOO, JFATXTT) is backordered and will ship as soon as it is back in stock.
Worry-free returns
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.
Tracking information will be provided once your order ships.
Bow Roller – Fits Multiple Trailer Brands (Replaces GlückMarine, MA...
Bow Roller – Fits Multiple Trailer Brands (Replaces GlückMarine, MARKGOO, JFATXTT) is backordered and will ship as soon as it is back in stock.
Product Details
This universal 7" X 4" Boat Trailer Roller Assembly with 1/2 Inch Shaft Bow Stop provides non-marking support for your boat's bow during loading and trailering. Designed for a universal fit, it is compatible with boat trailers equipped with a 1/2-inch mounting shaft, ensuring broad applicability.
It serves as a direct interchange for several models, including the GlückMarine 7" X 4", MARKGOO 7" X 4" Boat Trailer Roller, and JFATXTT 4" Bow Roller.
- Installs easily via a standard bolt-on 1/2-inch shaft.
- Constructed from durable, non-marking polyurethane to prevent hull damage.
- Includes one complete bow roller assembly for straightforward replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| GlückMarine | 7" X 4" |
| MARKGOO | 7" X 4" Boat Trailer Roller |
| JFATXTT | 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/Light Blue)
- 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)
- Fitting Type
- Bow Stop
- Thread Size
- 1/2 inch
- Other Technical Attributes
- Non-marking surface prevents boat hull damage
What’s in the Box
- 1 x Boat Trailer Roller Assembly (7" X 4") with 1/2 Inch Shaft
Installation Notes
- Safely secure the boat and trailer on a level surface before beginning work.
- Loosen and remove the nuts and bolts securing the old bow roller assembly.
- Slide the old roller off the shaft. Retain washers or other hardware for reuse if they are in good condition.
- Clean the mounting bracket and shaft to remove any debris or rust.
- Slide the new polyurethane roller onto the 1/2-inch shaft.
- Reinstall the assembly into the bow stop bracket.
- Tighten the nuts securely, ensuring the roller can still spin freely but is held firmly in its housing.
- Check the alignment with your boat's bow to ensure proper contact and support during loading.
Troubleshooting & FAQ
How do I confirm this roller will fit my trailer?
This is a universal bow roller designed for trailers with a 1/2-inch diameter mounting shaft. The most reliable way to ensure fitment is to measure your existing shaft to confirm it is 1/2 inch.
What is the advantage of a polyurethane roller over a standard rubber one?
Polyurethane (PU) is a non-marking material, which prevents black streaks, scuffs, and other marks on your boat's hull. It is also exceptionally durable and resistant to damage from sun, salt, and water compared to traditional rubber.
The center hole is 17 mm, but the shaft size is 1/2 inch (12.7 mm). Is this size difference correct?
Yes, this is intentional. The slightly larger center hole diameter allows the roller to spin freely on the shaft without binding, which is essential for smooth and frictionless boat loading and unloading.
When is it time to replace my bow roller?
Inspect your bow roller regularly for signs of deep cracks, flat spots, or significant material degradation. You should replace it if it no longer spins freely or fails to provide adequate, stable support for your boat's bow.
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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