Shimano M5100 Deore 10/11 Speed Single ChainsetReady to heighten your mountain biking confidence, this crankset offers fast acceleration and smooth performance as you explore the mountains. It features a rock-solid forged alloy crank arm construction, which gives it incredible strength as you take on every challenge. Shimano has also equipped this version with a HollowTech II integrated bottom bracket, so you can benefit from its increased stiffness, efficiency and additional durability. Features: Crank Arm Material: Forged Alloy Use: MTB Speed: 10/11 speed Design: 2-piece design Crank Arm Length: Multiple sizes available Axle Diameter: Chainline: 52mm Frame Compatibility: For use with 135 /142 mm O.L.D. frames 5 Arm or 4 Arm: 4 arm Chainring Size: Multiple sizes available Is BB Included: HollowTech II integrated bottom bracket Is Chainring Included: Yes Part Numbers: 30T 170mm: FCM5100C0; 30T 175mm: FCM5100E0; 32T 175mm: FCM5100E2; 32T 170mm: FCM5100C2Technologies: HollowTech II: HollowTech II integrated bottom bracket design uses a wide bearing placement with a large axle diameter for increased stiffness, efficiency and added durability.A 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.