SHIMANO TIAGRA BB-RS501 BSC crankset

Designed for 68/70 mm frames and 24 mm crank axles, the threaded bottom bracket SHIMANO Tiagra BB-RS501 BSA Hollowtech II bottom bracket features even smoother, more sealed bearings than the previous generation.

The size of the bearings has also been revised to make them lighter.

Ref: 7970331000998