TKR4181 "M5" Hardened Steel Mod1 Pinion Gear w/5mm Bore (21T)

This product is a high-strength Mod 1 pinion gear designed for 1/8-scale and other high-torque RC drivetrain systems. With a 21-tooth count and 5mm motor shaft bore, it is commonly used to fine-tune gear ratios for better balance between speed and torque in off-road and racing applications. The gear is CNC-machined from hardened steel for excellent durability and wear resistance under heavy load. It also features a large M5 set screw to ensure a secure hold on the motor shaft and reduce slipping during operation. It is compatible with many Tekno RC platforms as well as other vehicles using Mod 1 gearing systems.