Traxxas Revo Delrin 39T Spur RE-031 for tuning and upkeep by 3Racing  [RE-031]

39T acetal spur for Revo

This 39T Delrin spur is a direct-fit replacement aimed at Traxxas Revo owners who want quieter, more consistent gear mesh. The acetal material resists abrasion better than many softer plastics and provides dependable engagement under normal running conditions.

To install, align the spur on the gearbox output and set mesh against the motor pinion before final assembly; small shims or slight motor repositioning can eliminate backlash and reduce premature tooth damage. Check runout and bearing play after the first few minutes of operation.

In workshop or setup use the RE-031 is a reliable maintenance item rather than a high-power upgrade: change it when you notice worn teeth or persistent chatter, and keep lubrication and mating components in good order to avoid transferring wear to metal pinions.