SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET mountain-bike 75mm thinner than the Flash

75mm thinner than the Flash Pro

X-SYNC™ 2 chainring design increases chain retention

It also increases the range

saving you time and hassle

Spokes (Front): SAPIM CX-Ray

SHIMANO DURA ACE BB-R9100 BSA HOLLOWTECH II BOTTOM BRACKET mountain-bike 75mm thinner than the FlashThe 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