ULTEGRA Bottom Bracket SM-BBR60 ( Select Option=BSA)

The Shimano SM-BBR60 is a bottom bracket of type BSA which is recommended for Ultegra, 105, GRX, FC-CX70 and other Hollowtech II compatible cranks with 24 mm axle. It convinces with improved smooth running and low weight, but is just as durable as its predecessor. Bottom bracket shells with BSA thread are 68 mm wide. Suitable for frames with (B.C.1.37″ x 24T) English thread.