SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET over-2500 23 mm inner width proven

23 mm inner width proven to roll smoother with less drag for a faster wheel and tyre system

This results in even pad wear and easy pad adjustment with the addition of a barrel adjuster

Maximised central cut-out for perineal pressure relief and comfort

Integrated Mips Evolve Core™ technology with better rotational impact protection

SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET over-2500 23 mm inner width provenThe SHIMANO BB R9100 DURA ACE HOLLOWTECH II bottom bracket delivers precision engineering for the FC R9100 crankset. Featuring M36 x 24T Italian thread cups, this component combines lightweight construction with exceptional stiffness for competitive performance. The HollowTech II design ensures smooth, efficient power transfer with minimal friction. Compatible with frames using Italian threaded bottom bracket shells. Requires TLFC34 or TLFC24 tool