4 Inch Smooth Wobble Roller Assembly | Double Roller

A 4 inch smooth double wobble roller assembly for a boat trailer side arm. Two rollers sit on a hot-dip galvanised bracket and rock as the hull comes on, so the boat is not riding a fixed rubber wheel. One listing replaces the bracket and both rollers.

Viking Twin Wobble Roller Assembly, part 91941. Each roller is 4 inch with a 20 mm bore. The shaft is 18 mm, and that smaller shaft is what lets the rollers wobble. Sold in blue, red or black. The smooth face is the one to use on gelcoat and alloy plate. The 22 mm heavy-duty arm, part 91942, is a different assembly and is not this listing.

In the assembly

• 2 x 4 inch smooth wobble rollers, 20 mm bore
• 1 x hot-dip galvanised double bracket, 18 mm shaft
• Part 91941
• Blue, red or black

Roxom and Bunnings sell the roller on its own at about $10. This page is the pair plus the bracket. Rollers only, if the bracket is still sound, are the 4 pack of 4 inch smooth wobble rollers. A pair of these assemblies is the 2 pack. Four arms are the 4 pack.

Bolt it in place of the old side arm. Check the spindle is 18 mm before you tighten it. One assembly is one side of a small trailer.