Manutec Boat Trailer 4″ Cotton Keel Roller with Galvanised Bracket & Spindle Kit – 17mm Bore (SKU: BDA058)

The BDA058 is a compact, complete cotton keel roller kit from Manutec, ideal for fiberglass boats needing maximum care in minimum space.
This 4″ (105mm width) roller provides soft support that won’t scuff or scratch your hull, and comes with a galvanised bracket and spindle—ready to mount.

Designed with a 17mm bore to suit 16mm shaft setups, this kit offers a secure fit and is ideal for narrow keel areas or small trailers.
The UV-stable material ensures long-lasting durability even under Australian sun and salty conditions.

With its soft-touch roller and marine-grade hardware, this is the gentle but strong solution for your delicate hull.

Specifications:

A reliable, soft-contact support system tailored for delicate boat hulls—especially fiberglass beauties.

Frequently Asked Questions

• Is this kit safe for fiberglass?
  Yes, it’s specifically designed to protect fiberglass hulls from marks or scratches.
• Does it include the spindle?
  Yes! Bracket, roller, and spindle all included.
• Will the roller last under UV exposure?
  Absolutely—it’s made from UV-stable material suitable for Australian conditions.
• Can I use it on an aluminum boat?
  Yes, but poly rollers may offer firmer support for heavier alloy setups.

Is This the Right Kit for You?

Recommended For:

• Fiberglass boat owners needing soft, non-marking hull support
• Trailer setups with limited roller width space (105mm or less)
• DIYers seeking a complete and quick-fit roller solution

Not Recommended For:

• Boats requiring wider keel rollers
• Heavy-duty trailers using non-standard spindles

Installation Tips:

1. Attach the bracket securely to your trailer frame using appropriate fasteners.
2. Insert the spindle through the roller and bracket holes.
3. Center the roller and add spacers as needed to prevent lateral movement.
4. Spin test before boat loading to ensure alignment and clearance.