Shimano Sora FC-R3000 Crankset FEATURES: 2-piece crank construction Anodized aluminum and resin outer ring Steel inner ring 4-bolt crankset SPECS: Number of Chainrings Double Crank Length (mm) 170 Pedal Spindle 9/16" Crank Intended Use Road Chainline/Hub Compatibility 130 Hubs , 135/142 Road Disc Hubs > 415 mm Chainstay Rings 50/34 Spindle Interface Type Shimano Hollowtech II Drivetrain Speeds 9 Chainring BCD 110 Shimano Asymmetric BB Included No