Shimano XT M770 Hollowtech II crankset maximizes stiffness while keeping weight to a minimum.  It features a precision two-piece construction for perfect chainline and chainwheel alignment and a carbon/steel composite middle ring for better shifting. This will also increase service life, and smoothly delivers power to the cassette. * New 10 speed.

Features:

• Dyna-Sys component
• Increased stiffness and improved shifting performance
• Outboard bearings maximize stability and stiffness
• Steel/carbon composite construction and middle gear doubles durability
• Thicker and stiffer 44T ring.
• Crank Arm Material/Finish: Aluminum/Anodized
• Spider Arm Material/Finish: Aluminum/Anodized
• Outer Ring Material/Finish: Aluminum/twice Anodized
• Middle Ring Material/Finish: Steel + Composite/Plated  
• Inner Ring Material/Finish: Aluminum/Anodized
• Bottom Bracket: SM-BB70 Included.
• Outer Chainring 42T
• Middle Chainring 32T
• Inner Chainring 24T
• Chain Compatibility: HG-X 10-speed
• Cassette Compatibility: 10-speed
• Weight: 768g cranks only