The sram x01 drivetrain carries on the tradition of srams championship winning 1x philosophyall the way down the mountain the setup is simpler the drivetrain is lighter and the shifting is fast and solid bottom line x01 is the right one for any terrain every time five available chain rings 30 32 34 36 38 sold separately allow you to tune your gear range to match your terrain wheel size and riding style each x sync chain ring fits a single universal spiderallowing you to change r