The MT520 two-piece aluminum crankset features a beefy design to support Trail/Enduro applications, with a durable steel, 4-arm chainring, and a 24 mm steel axle. This crankset is designed for a wide variety of uses and riders that can benefit from its affordability, strength and durability Two-Piece Construction for a rigid and durable aluminum crankset spinning on a 24 mm steel crank spindle Features DYNAMIC CHAIN ENGAGEMENT+ special gear teeth profile that is designed for use in single-chainring configurations for XC, enduro, and trail riding to provide more chain retention and smoother pedaling - even over bumpy terrain 4-Arm asymmetric 96 BCD chainring features and ultra-durable steel construction to support trail and enduro use Designed for 55mm chainline and 148 Q-Factor Item Specifications BB Included No Chainline/Hub Compatibility 141/148 Boost Hubs Chainring BCD 96 Shimano Asymmetric Color Black Crank Intended Use Mountain Crank Length (mm) 165 Defined Color Black Drivetrain Speeds 12 Number of Chainrings Single Pedal Spindle 9/16" Rings 30 Spindle Interface Type Shimano Hollowtech II Shimano FC-MT520 Crankset Crankset UPC: 192790954912