Model Number FC-M770-10 Series Deore XT Crank Construction Cassette Compatibility 10-speed Chain Compatibility HG-X 10-speed 4-Arm Chainrings Cahainring Sizes Bolt Circle Diameter Crank Arm Length 165, 170, 175, 180mm Crank Arms Outer Chainring 42T Middle Chainring 32T Inner Chainring 24T Chainring Bolts & Nuts Chain Guard Chaincase Compatible Bottom Bracket SM-BB70 E-type FD Compatible Chain Line 50mm BB Shell Width Average Weight