Boat Trailer 4″ Blue Poly Keel Roller & Galvanised Bracket Kit – 17mm Bore for 16mm Shaft (SKU: BDA014)

The BDA014 is one of the most compact keel roller kits in our range—perfect for tight trailer frames, small vessels, or specialized keel support positions.
It includes a 4″ (102mm wide) blue polypropylene roller, a galvanized steel bracket, and clamp-on stem adjusters.

With a 17mm bore made to suit 16mm spindles, this kit is optimized for light-duty use where precision and space efficiency matter.
The non-marking poly protects your boat’s hull from damage, while the UV-stable formula stands up to sun and salt.

The bracket includes 50mm x 50mm clamp-on stems for quick installation, and we offer alternative clamp sizes to fit different trailer frames.

Specifications:

Ideal for DIYers, boat builders, and trailer owners needing maximum control in minimum space.

Frequently Asked Questions

• Is 4″ enough for boat support?
  For light boats, tight space setups, or support positions near the bow/stern—yes.
• Does it come with the spindle?
  No, this kit includes roller and bracket only. Spindles are sold separately.
• Is it safe for alloy boats?
  Absolutely. The poly is non-marking and designed for delicate hull materials.
• Can I use a different clamp size?
  Yes. Alternate clamp-on stems are available upon request.

Is This the Right Kit for You?

Recommended For:

• Small boat or kayak trailers
• Trailer setups with tight mounting space
• Alloy boat owners needing non-marking keel support
• Anyone using a 16mm spindle system

Not Recommended For:

• Heavy or large boats needing more surface coverage
• Installers looking for a spindle-included solution (see BDA015 instead)

Installation Tips:

1. Secure the bracket to the trailer frame with clamp-on stems.
2. Insert your 16mm spindle through the roller and mount it in the bracket.
3. Use washers or spacers if needed for centering.
4. Tighten all bolts and ensure the roller spins freely.