Shimano BB-RS501 Hollowtech II English Bottom Bracket Bells & Horns Shift ramp designs provide fast

Shift ramp designs provide fast and smooth shifts by HYPERGLIDE+ technology

2018 Women's Stumpjumper Comp Carbon 27

Double ”X” bridge shape allows for precise gear shifting

4-piston hydraulic post mount brake that offers powerful and controllable braking

Shimano BB-RS501 Hollowtech II English Bottom Bracket Bells & Horns Shift ramp designs provide fastThe Shimano BB RS501 bottom bracket features an enhanced seal construction to provide long lasting performance and service life. Designed for a perfect fit with Hollowtech II 24mm crank spindles Anodized aluminum cups are high strength and light weight For use with English thread bottom bracket frames