SRAM X01 11 Speed Crankset 94 BCD BB30. It's time to ditch that front derailleur and move to a 1x drivetrain. The SRAM X01 BB30 11 speed crankset, featuring trickled down technology from XX1 plus the same sleek appearance, offers it to enduro, all mountain, XC and trail riders at a more affordable price. Carbon crank arms are light, rigid, strong and optimize power transfer in demanding, off road conditions. Five available chainrings 30T 32T 34T 36T 38T let you tune your gear range, so you can match your terrain, wheel size and riding style chainrings not included, purchase separately: SR X30, SR X32, SR X34, SR X36 or SR X38. Each chainring fits a single, universal spider, so you can change rings without removing the crank arms.