COLOFULWAY 3-inch Bow Roller Assembly for Trailers, 3" TPU Roller, 1/2" Shaft, Blue

COLOFULWAY's 3" poly bow roller assembly is a complete blue polyurethane roller kit with bells and a 1/2" mounting bolt, built to protect your boat and support trailer loading.

This compact assembly combines a 3-inch thermoplastic polyurethane (TPU) roller, two end bells, and a 1/2-inch diameter bolt to create a durable bow support for trailers with a 3-inch bracket opening. The roller's TPU construction resists corrosion, avoids marking gelcoat, and cushions hull contact during launching and towing. With a 5-inch overall width, it's engineered to keep the boat aligned and absorb road shock while preventing bolts or metal edges from scraping the hull.

How does this roller protect my boat during launch and retrieval?

The soft-but-resilient TPU surface reduces direct metal-to-hull contact, so the bow slides smoothly when launching or loading. The roller compresses slightly under load to absorb bumps and road vibration, lowering stress on the trailer and boat hull.

• 3" roller diameter matches common bow profiles for even contact.
• TPU material resists flat spots and keeps finish unmarred.
• End bells block metal edges from contacting the hull.
• 1/2" bolt secures the assembly firmly to a 3" bracket.

Will this part withstand saltwater and outdoor conditions?

The roller is made from thermoplastic polyurethane, which is resistant to corrosion and does not rust like metal alternatives. Because it’s produced by injection molding, the material maintains consistent density and shape, giving long-term durability under wet conditions.

• TPU resists saltwater and UV exposure better than untreated metals.
• No rusting components in contact with the hull.
• Injection-molded construction reduces material inconsistencies.
• Designed to avoid flat spots during lengthy storage.

How do I fit this assembly to my trailer, and what measurements matter?

Installation is straightforward: the kit includes the 1/2" diameter bolt to pass through the roller and bells and secure into a 3" bracket opening. Confirm your trailer’s bracket accepts a 3" roller diameter and a 1/2" mounting shaft before purchase for a proper fit.

• Roller diameter: 3 inches; overall width: 5 inches.
• Mounting bore: 1/2 inch (bolt included).
• Includes two end bells to keep the roller centered and protect the hull.
• Fits trailers with a 3" bracket clearance.

What maintenance does this assembly need to last longer?

Routine inspection and basic care keep the roller functioning well for seasons. Rinse after saltwater use and check fasteners and bells for wear; replace the roller if it develops deep gouges or severe deformation.

• Rinse with fresh water after saltwater exposure.
• Inspect the 1/2" bolt and tighten as needed.
• Check bells and replace if cracked or loose.
• Store out of prolonged direct sunlight when possible.

Who is this for? Boaters and trailer owners looking for a compact, corrosion-resistant bow support will find this COLOFULWAY 3" TPU roller assembly ideal. It suits owners of small to medium boats who need a dependable, non-marking roller that fits a 3" bracket and uses a 1/2" shaft. Contractors, marinas, and recreational boaters who want a low-maintenance, impact-absorbing solution to protect the hull during towing and launching will benefit from this kit’s included bells and mounting bolt.