Viking 4in Keel Roller – Black Rubber, 17mm Bore

Keel roller's flat-spotted and your boat's rocking side-to-side on the trailer. You know that feeling — you pull up, check it, and the hull's shifted.

The Viking 4in keel roller (part 91211) is the straightforward fix. Four inches of black rubber on a 17mm bore. Screws or bolts onto your existing trailer bracket. No fiddly adapters, no measuring.

It's a soft-rubber budget option. That means it grips well and won't crack in cold weather, but it can scuff a fresh gelcoat over time. For a working boat that sees regular trailering, that trade-off makes sense.

If your current roller is the same 17mm bore, this is a direct swap. Add to cart

• 4-inch keel roller for mid-hull trailer support
• 17mm bore fits standard boat-trailer axles directly
• Black soft-rubber compound — flexible in cold, grips the hull
• Viking Rollers part 91211 (supplied via JAYCAR)
• Budget alternative to urethane rollers; may mark gelcoat over time