The Shimano Tiagra BB-RS501 bottom bracket is for frames with BSA thread and allows you to install a crankset with a 24 mm axle into a road bike frame with threaded bearing. Shimano recommends BB-RS501 for the cranksets of the Tiagra, Sora, Claris, Alfine, GRX RX600 series and for a number of no-group models. It features an optimised seal design that extends durability. The bearings are made of steel, the bearing cups of anodised aluminium. In combination with a corresponding crankset, this bottom bracket and its Hollowtech II technology ensures stability and efficiency with every pedal rotation. Application: Road, Cyclocross, Gravel, City Type: BSA Shell Width: 68 mm Axle Diameter: 24 mm (Hollowtech II) Bearings: steel Bottom Bracket Cup Material: aluminium Compatibility: Recommended for: Tiagra FC-4700, FC-4703 Sora FC-R3030, FC-R3000 Claris FC-R2030, FC-R2000 Alfine FC-S501 GRX FC-RX610, FC-RX600 FC-RS520, FC-RS510, FC-R460, FC-RS400 FC-CX50 Features: anodised bearing cups improved seal design long life Contents: Shimano BB-RS501 bottom bracket, consisting of: 1 x right bearing cup with bearings 1 x left bearing cup with bearings 1 x bottom bracket centre sleeve Weight: 93 g
