X01 single chainset bb30 11 speed built for total chain control each tooths thickness is cnc machined to fit better into the chains inner and outer links cnc machined 7075 two tone anodized x sync chainringan integral component of the sram 1x drivetrain x sync tall square tooth design provides maximum chain control sharp narrow tooth profile and rounded chamfer edges help manage a deflected chain mud clearing recesses for the inner chain links and rollers chainring guard option carbon a