The Shimano FC-M5100 crankset features an optimized gear combination and gear ratios designed for trail riding.10/11-Speed. For 52mm chainline. Item Specifications: Crank Length (mm), 175 mm, Crank Intended Use, Mountain, Drivetrain Speeds, 11, Chainline/Hub Compatibility, 141/148 Boost Hubs, BB Included, No, Drivetrain Speeds, 10, Rings, 32, Color, Black, Number of Chainrings, Single, Pedal Spindle, 9/16",.