Spindles

Boat trailer roller spindles are the pins or shafts that allow your trailer rollers to rotate freely, which is critical for smooth boat launching and retrieval. They are typically categorized by their length, diameter, and material, which you should match to your existing roller and bracket setup, Common Diameters: 16mm is the standard for most 4.5″ to 8″ rollers. Heavy-duty applications or larger 10-12″ rollers may require 18mm, 20mm, or even 24mm diameters.