FSA MegaExo MTB Bottom Bracket (BB-9050)MegaExo bottom bracket for use MTB NBD MegaExo cranksets.Features: Oversize cartridge bearings Forged alloy and CNC machined external cups Alloy center sleeve w/ double o-ring seals Sizes: English threading - 68/73mm width (BC-1.37in x 24T) Weight: 110gBuy FSA Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.