Features of the Shimano XT BB-MT800 Press Fit Bottom Bracket Improved driving rigidity Close ratio gear combination for minimum shifting gap and maintaining rhythm Enhanced chain retention Better sealing and better rotation Various choices for bike and riding style More durable chainwheel teeth New 3D composite chain ring's teeth composition is optimized for each chainwheel load out with steel driving gear teeth and aluminum support gears Ride anywhere 11-speed rider tuned gearing The power to choose how and where you ride Gear combination: FC-M8000-3: 40-30-22T FC-M8000-2: 38-28T, 36-26T, 34-24T FC-M8000-1: 30T, 32T, 34T Chain line 3mm outBoard spec available Weight: 773.9g (40-30-22T, w/o BB) 695.5g (34-24T, w/o BB) 680g (30T, w/o BB) Consistent shifting Performance and enhanced chain management Optimal balance of durability and lightweight High efficient and precise shifting Press-Fit BB Shell Width: 89.5 mm, 92 mm, 107 mm