Shimano Altus FC-M311 7/8 Speed Crankset No Chain Guard 170mm BlackThe Shimano Altus FC-M311 Crankset uses Hyperdrive SG-X chainrings and is compatible with your 7 or 8 speed mountain bike. The gears on it are 48-38-28t and does not come with a chain guard. The crank arms have a square taper interface. The Bottom Bracket is not included. The recommended bottom bracket spindle length is 123mm. Available in crank arm lengths 170mm and 175mm. Available in Black.689228132696
