Shimano BB-MT501 Bottom Bracket - Hollowtech II | Thread Type | BSA-68/73-24

The Shimano BB-MT501 bottom bracket at the level of the Deore series ensures smooth rotation of the crank's spindle improving the drive efficiency. In addition, a special seal design extends the service life noticeably. The bearing shells with BSA thread are perfectly matched to the interaction with Hollowtech II cranksets.

Material:
bearing shells: aluminum (anodized)
sleeve: resin