The square-bottom-bracket-compatible Shimano Altus FC-M311 crankset is comprised of a rigid 2-piece design and Hyperdrive SG-X chainrings. An optional chain guard is included with pre-installation for protection against dirt and debris. It also features Dual SIS compatibility.
Chain guard compatible. Chainwheel, number of teeth: 42x32x22 Fitting for derailleur: 7-speed ||| 8-speed Material: aluminum, steel Type of chain: HG 7/8-speed