The FC-M315 mountain bike crank delivers precise and reliable shifting for 2x7 and 2x8-speed drivetrains.Features-48.8mm Chainline-Q-factor: 179.4mm-SG-X chainrings-Consistent off-road front shifting-Hyperdrive-Includes crank fixing boltItem Specifications-BB Included:No-Chainline/Hub Compatibility:135/142 MTB Hubs-Chainring BCD:Riveted-Color:Black-Crank Intended Use:Mountain-Crank Length (mm):170-Defined Color:Black-Drivetrain Speeds:7,8-Number of Chainrings:Double-Pedal Spindle:9/16"-Rings:36/22-Spindle Interface Type:Square Taper JIS