High-strength 17T pinion gear (1st gear) made from tough 7075 T6 alu and specially hardcoated for superior strength, light weight, and high durability. Created on a special gear machine, all pinions feature ultra-precise tooth shaping and ultra-true running for vibration-free operation. Fine internal threading allows easy installation on XCA clutchbells (standard or lightweight versions). Each pinion is fine etched with the tooth number for easy & quick identification. Available in popular gearing sizes, allowing you to find the perfect gear ratio for any track.