This pinion gear consists of difficult anodized chrome metal, it's 48-53HRC certified. You may get the power you would like for your automobile through changing pinion gear. With similar external gear, you are able to change your pinion gear (within allowable range) to have various torque and rate. (The lower the T count, greater the torque; the bigger the T count, the quicker the speed.)
Specification: Bore Diameter: 5mm / Modulus: 1.0mm / Steel Pinion: 40CR
Applications: the most popular 1/8th off-road (buggy and truggy)