Bike Crank,8/9/10/11 Speed Left Crank Set 170mm Bike Crankset Bcd Crank Aluminum Alloy Bike Crank Mountain Bike Crank Arms Crank Set 104 Bcd 170mm 104 Arms Crank Alloy - Crank 170mm Bcd Alloy

Aluminum alloy material for light weight and strong strength. Square tapered crank arms. Compatible with 8 / 9 / 10 / 11 speed. 170mm length for crank arm. Come with a 4-bolt chainring.Narrow&wide teeth increase chain retention and wear life,reduce friction and noise.