SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET trek kids Ultra-light hollow carbon fiber crankarms

Ultra-light hollow carbon fiber crankarms are 29 g lighter than previous generation

Features Oxford Aquatex Triple Bicycle Cover

Vee Tire Co tires

A simple yet effective upgrade for dropper post systems

20 x 2 inch tyres for BMX-specific grip and handling

SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET trek kids Ultra-light hollow carbon fiber crankarmsThe 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