Tamiya 3515018 - 14T Pinion gear for F101/102 Group C and F1 chassis  [3515018]

14T Pinion for F1 chassis

This 14T pinion is an RC-scale motor pinion sold under the Tamiya 3515018 designation. It serves as a direct replacement pinion to alter or restore gear ratios on compatible F1-style Tamiya chassis and Group C F101/102 models. The part is identified by its tooth count rather than a proprietary material callout, so confirm the 14-tooth specification when matching to your spur gear.

Compatibility is governed by chassis and motor shaft interface; verify the item number against your chassis parts list before installation. Typical installation replaces the existing pinion on the motor shaft using the original set screw or retention method, and should be done with the motor removed from the chassis to check mesh and endplay. Adjust spur mesh carefully to avoid premature wear on teeth or bearings.

In tuning terms, a 14-tooth pinion changes drive ratio relative to other tooth counts: fewer teeth increase torque and reduce theoretical top speed, while more teeth do the opposite. Use tooth-count changes in small steps and test under controlled conditions to find the balance between acceleration and sustained speed that suits your setup.

Check shaft diameter and set screw type on your motor and confirm part number 3515018 before ordering to ensure fitment with your Tamiya F101/102 or F1 chassis.