The BB-6000 MegaExo Threaded Cartridge Bottom Bracket is best suited for use in road bikes with a BSA/English bottom bracket shell and cranksets that have a 24mm spindle. Featuring sealed cartrige bearings and CNC machined external cups, this bottom bracket will upgrade a square taper BSA bottom bracket or be a great replacement for a worn out external cup BSA bottom bracket. Features: Features alloy cups, composite center tube and stainless bearings Due to varying dimensional tolerances between manufacturers, FSA MegaExo bottom brackets are not compatible with any other brand of crankset Different models of MegaExo bottom brackets are designed to be specific to each model of FSA crankset Compatible with pre-2014 Gossamer and Energy cranksets that utilize pinch bolts Specifications: Frame Interface: BSA/English Threaded Spindle Interface: FSA MegaExo BB-6000 (24mm) Bottom Bracket Shell ID: 1.37 Shell Width: 68mm, 73mm Material: Alloy, Composite, Stainless Steel Color: Gold Weight: 100g