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