SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET mountain-bike Spokes (Front): SAPIM CX-Ray

Spokes (Front): SAPIM CX-Ray

X-SYNC™ 2 chainring design increases chain retention

Bicycle bag for use in all kinds of weather

Durable Nylon mini-ripstop fabric with DWR

Special design allows installation of the TopLoaders and MidLoaders on many frame sizes

SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET mountain-bike Spokes (Front): SAPIM CX-RayThe 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