4130 trapezoid heat treated tubular chromoly crank arms Trapezoid shape helps reduce flex while still offering a grindable surface Wrap-welded pedal bosses RHD and LHD compatible sprocket bosses Available in 165,170 and 175mm lengths 8 spline pinch bolt style interface BB Axle included 165mm 19mm BLK 34.5oz 1UPC/EAN/GTIN: 811120037018