Renowned around the world by track racers, couriers and freestyle riders alike, our TK series hubs run on Japanese sealed bearings for longevity and speed.At the core of our TK hubs are drilled Cr-mo steel axles to keep weight down and strength up.The TK rear hub remains one of the finest track hubs on the market.The double sided flip/flop TK Rear hub is available with fixed and free wheel options.