The sram xx1 gxp 11 speed q factor 170mm crank is built for total chain control each tooths thickness is cnc machined to fit better into the chains inner and outer links helping make your 1x drivetrain simpler lighter and more durabble this crank is supplied with a 32t direct mount x sync chainring available in 2 tone anodized blackred matching cranks and chainring 170mm long only