Wolf Tooth T47 External Bottom Bracket - T47 External 68/73mm For 24mm/Shimano Spindle Orange Model=Tiagra SL-4600 Shift Lever Tuned to deliver confidence and

Tuned to deliver confidence and control on the toughest tracks

Integrated stabilization pad centers the knee and ensures a secure fit

Roll-top closure

Brake Caliper Type Post Mount Mount | Rotor Size 160 Post | 200 Rotor

Lower headsets on bikes with Knock Block do not have any unique features

Wolf Tooth T47 External Bottom Bracket - T47 External 68/73mm For 24mm/Shimano Spindle Orange Model=Tiagra SL-4600 Shift Lever Tuned to deliver confidence andWolf Tooth T47 External bottom Brackets are engineered to be smooth durable lightweight fast and user serviceable. Their ground up design features custom bearings seals bushings and cups which eliminate creaking and balance best in class weather sealing with optimized bearing radial compression alignment and preload for low drag. The Wolf Tooth Bottom Bracket bearings feature custom designed balls and races that are made from a hardened chrome bearing