High-strength 21T pinion gear (2nd gear) for the XRAY NT1 are made from tough 7075 T6 alu and specially hardcoated for supreme 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.