• Alivio M3100 Series • SG-X chainrings for precise and reliable shifting • 2-piece crankset construction • Anodized cranks • Includes black chain guard Specifications • 3x9 speed • Crank arm length: 170mm • Chain ring combination: 40/30/22T • Chain line: 50mm • Compatible chain: HG 9-speed • Crank fixing bolt included: Yes • Recommended BB: BB-MT500 • Q-factor: 176mm