SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET 2026-MTB-999to2999 Features Shimano Tiagra RD-4700 Pulley

Features Shimano Tiagra RD-4700 Pulley Set

Recommended brake rotor: SM-RT64

Safety release clips detach passively when an object becomes lodged

Scout Bike is an essential piece of kit

SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET 2026-MTB-999to2999 Features Shimano Tiagra RD-4700 PulleyThe SHIMANO BB R9100 DURA ACE HOLLOWTECH II Bottom Bracket is engineered for the FC R9100 crankset, delivering the stiffness and lightweight performance demanded by competitive cyclists. Featuring smooth rolling bearings and a precision engineered design, this component ensures efficient power transfer and responsive handling. Compatible with 68mm BSA English threaded frames, it's the essential foundation for your Dura Ace drivetrain. Installation