2975 Dunbier 6" Self Centre Rubber Roller | Marine Trailer Part

🔧 Product Description

Dunbier Self-Centring Rubber Keel Roller 6" – Part Number: 2975

A shaped black-rubber keel roller that automatically guides the keel toward the centre of the trailer as the boat is retrieved. The deep centre profile is suitable for use at key centreline positions where initial alignment is important.

⚙️ Key Features

• Self-centring concave rubber profile
• Resilient contact surface for fibreglass and painted hulls
• Six-inch nominal length
• Common Dunbier centreline roller
• Replaceable on a standard 16mm pin system

📏 Specifications

• Length: Approximately 153mm
• Maximum diameter: Approximately 63mm
• Centre bore: Approximately 16mm
• Matching pin: Dunbier 3000B or 3000S, approximately 200 × 16mm

🔄 Cross Reference & Related Parts

• Dunbier: 2975
• Small poly V-block: Dunbier 2977
• Large poly V-block: Dunbier 2979

🚤 Trailer Compatibility & Application

• Suitable for keel-line brackets with sufficient width
• Useful as a rear or intermediate centring roller
• Roller height must be coordinated with adjacent keel rollers and side supports

🔌 Function

Guides the keel into the trailer centreline and supports it during loading and transport.

⚠️ Common Signs of Failure

• Centre groove is worn off-centre
• Rubber is cracked or hardened
• Roller sticks on the pin
• Boat repeatedly enters the trailer off-centre
• Bore is enlarged

🛠️ Installation & Safety

• Align the roller precisely with the trailer centreline
• Use a straight 16mm pin
• Set height to engage the keel without carrying excessive total hull load
• Confirm free rotation
• Recheck alignment at the ramp

📦 Condition

• Brand new Dunbier Marine Products trailer component
• Supplied as one 6-inch self-centring rubber roller
• Supplied in original or equivalent packaging