Boat Trailer 4.5″ Blue Poly Keel Roller & Galvanised Bracket Kit – 17mm Bore for 16mm Shaft (SKU: BDA016)

The BDA016 is a compact and reliable keel roller and bracket combo, ideal for small boat trailers and tight installations.
It includes a 4.5″ blue UV-stable polypropylene roller with a 17mm bore, designed to fit 16mm spindles, along with a hot-dip galvanized standard bracket.

With a narrow 114mm roller width and 50x50mm clamp-on stem adjusters, this kit is perfect for compact trailers where space-saving and weight distribution are essential.
The non-marking poly roller is gentle on alloy and fiberglass hulls, while the galvanized bracket resists corrosion for long-term use.

Additional clamp sizes are available if your trailer frame dimensions vary.

Specifications:

A perfect match for light-duty trailers and customers looking for a no-fuss, quick-install, small-format roller solution.

Frequently Asked Questions

• What kind of trailers is this for?
  Compact or lightweight trailers where a smaller roller is preferred or required.
• Does it fit a 16mm spindle?
  Yes, the roller bore is 17mm—ideal for 16mm shafts with a little clearance.
• Will it scratch my boat?
  Nope! It’s made from non-marking UV-resistant poly, safe for alloy and fiberglass hulls.
• Can I use other clamp sizes?
  Yes, clamps in other sizes are available to match different trailer frame widths.

Is This the Right Kit for You?

Recommended For:

• Light-duty boat trailers with space constraints
• Users needing a 4.5″ roller for lower-profile trailer setups
• Owners of alloy, tinny, or PWC-style boats
• DIY installs with 16mm spindle requirements

Not Recommended For:

• Heavy-duty boats requiring wider or reinforced rollers
• Users expecting automatic height adjusters or welded bracket systems

Installation Tips:

1. Mount the clamp-on bracket to your trailer frame using included or appropriate hardware.
2. Insert a 16mm spindle through the roller and bracket.
3. Adjust roller height using the 50x50mm stem adjusters.
4. Test spin and tighten all bolts for safe operation.