Shimano XT M8000 Single 11 Speed ChainsetRide anywhere. 11 speed crankset with various chainring options. Various choices for bike and riding style. More durable chainwheel teeth New 3D composite chainring's teeth composition is optimized for each chainwheel load out with steel driving gear teeth and aluminium support gears. Improved driving rigidity. Loose ratio gear combination for minimum shifting gap and maintaining rhythm. Enhanced chain retention. Better sealing and better rotation Please note, Bottom Bracket is NOT included Features: Cassette Compatibility: 11 4-Arm Chainrings: Yes Bolt Circle Diameter: P.C D. 96mm Crank Arms: Hollowtech II Technology Bottom Bracket: BB-MT800/BB-MT800-PA BB Shell Width: 68, 73mm Chainring: Included, 4-ArmA 2 year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products) Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.