Aerozine BB-08-XC MTB Bottom Bracket BB English Threaded BSA 68 73mm Ceramic Bearings 90g For Shimano Sram Road/MTB BSA system use Ceramic Bearings-More stiff and lighter English threaded 68/73mm width ( BC-1.37x 24T) Color:Black/ Red/ Silver/Gold/Blue/Orange/Green/Pink available Weight :90g