The Elevn External Euro BB features 2 oversized precision sealed bearings in forged aluminum cups that ride on the outside of the BB shell for increased strength and durability. Compatible with cranks such as Shimano, Bombshell Spinnergy, Rhythm, Sinz Elite XXX and other cranks that use a 24mm spindle size. Features: Etched Logo Forged Aluminum Cups Compatible with 24mm race cranks designed to be used with external bottom brackets Specifications: Spindle Type: 24mm Bearings: Waterproof Ceramic Sealed Bearings Weight: 107 g / 3.8 oz