High-strength 15T pinion gear (very first gear) made from tough 7075 T6 aluminum and specially hardcoated for superior energy, light-weight, and high durability. Produced on a unique gear device, all pinions work ultra-precise enamel shaping and ultra-true running for vibration-free operation. Fine interior threading permits effortless installation on XCA clutchbells (standard or lightweight versions). Each pinion is finely etched utilizing the tooth quantity for easy & fast recognition. For sale in popular gearing sizes, helping you to obtain the perfect gear ratio for virtually any track.