What Makes the Shimano Altus FC-M311 a Reliable Triple Crankset?

The Shimano Altus FC-M311 is a 3x7/8-speed MTB crankset built for mountain bikes and commuters that need reliable, wide-range gearing without a high price tag. Aluminum crank arms keep weight reasonable while the riveted steel SG-X chainrings deliver the wear resistance and front shift quality that daily riding demands -- steel rings last significantly longer than aluminum under the repeated friction of chain contact, especially on frequently-used triple setups. Hyperdrive chainring profiling with shift ramps and pins delivers smooth, predictable front shifting through the 48/38/28t range whether you're tackling a trail climb or grinding a commute.

Square taper JIS bottom bracket interface -- a compatible BB is required and sold separately (check your frame for 68mm or 73mm shell width). Riveted chainrings are not replaceable individually. Compatible with 7- and 8-speed Shimano MTB drivetrains and 135/142mm rear hubs. MPN: EFCM311C888XL.