Sram x01 11 speed chainsetsram x01 is built for total chain control with each tooths thickness cnc machined to fit better into the chains inner and outer links and mud clearing recesses for the inner chain links and rollers the sharp narrow tooth profile and rounded chamfer edges help manage a deflected chain the two tone anodised x sync chainring is an integral component of the sram 1x drivetrain carbon arms feature a forged aluminum spider for strength features arm material carbon