This FSA Team Issue ATB MegaExo Bottom Bracket is a external bottom bracket for MegaExo cranks with a 24mm spindle. The oversize cartridge bearings sit in a forged alloy and CNC'd cups are protected by a double O-ring seals. The Team lssue BB is suitable for mountain bikes 68 and 73mm bottom bracket shells.  Fsa BB9050 MegaExo Team Bottom Bracket Features Oversize cartridge bearings Forged alloy and CNC external cups Alloy centre sleeve with double o-ring seals Usable with 24mm spindle Size: 68 and 73mm width Anodised cups and sleeve Weight: 150g