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 48 spline press fit style interface BB Axle included 170mm 19mm CP 34.5oz 1UPC/EAN/GTIN: 811120037100