Boat Trailer Keel Roller 115 x 85 mm – 17 mm Shaft, Heavy-Duty for Mid-Size Boats

This 115 x 85 mm keel roller is built to provide greater load capacity and stability for the keel of mid-sized boats. Its larger 85 mm diameter improves weight distribution and allows the roller to turn more easily under heavy load. Designed to mount on a standard 17 mm trailer shaft, it’s an excellent upgrade or replacement when your old rollers wear out.

The roller comes in both white polyurethane and black rubber variants. The white polyurethane roller is ideal for boats with light-colored or delicate hulls because it won’t leave marks and offers a firm, non-marring support. The black rubber roller provides classic elasticity and toughness – a great choice when maximum grip and durability are needed. Both versions are engineered for marine use and will resist damage from sun exposure and saltwater.

With its 115 mm length and expanded 85 mm diameter, this roller keeps your boat’s keel well-centered on the trailer and spreads out the weight during travel. The larger diameter means less friction and effort when winching the boat, which makes loading a medium-sized boat smoother and easier. At the same time, the roller cushions the hull by absorbing shocks and vibrations that occur during towing, thereby protecting your boat.

Use Cases and Recommendations:

• Recommended for boats about 4–6 meters in length, providing strong keel support for heavier or wider hulls
• Use the white roller for fiberglass or painted hulls where avoiding marks is a priority, and the black roller for maximum resilience under heavy loads or general-purpose use
• Pair this keel roller with appropriate side rollers on your trailer to ensure the entire hull is supported and secure during transit
• Though this heavy-duty roller is long-lasting, inspect it periodically along with the shaft – replacing the roller when worn will ensure your boat’s hull remains protected over time