Brand: Team Associated
Part Number: 3924
A 66-tooth, 48-pitch spur gear used across Associated's on-road and oval line (RC10R5, TC4/TC5, RC12R5.1 and others). Changing spur size is the quickest way to adjust final drive ratio for a track or motor. Spur gears wear over time, and a chipped tooth can strip the gear mesh. Keep a spare in your pit box.