Designed for 5-arm standard, mid-compact, compact and Cyclocross setups. FEATURES : One-Shot Cold Forging: Exclusive manufacturing process creates a more complex tooth profile and allows more shifting features on a chainring which normal CNC manufacturing won't allow. Individual tooth profiles, alternating tooth angles, timed ramps and tactically placed shift pins are all jam packed onto a Praxis ring. Process creates a harder and tougher tooth overall durability LevaTime: Praxis unique timing and shifting technology. Several shift pins are placed strategically at points on the ring to provide a perfectly timed lift. Synchronized ramps are tuned with a specific inner ring, providing a clean channel for the chain to move Heat Treated and Hard Anodized 7075 T6 Aluminum Individual tooth profiles, alternating tooth angles, timed ramps and tactically placed shift pins are all jam packed onto a Praxis ring. Process creates a harder and tougher tooth overall durability Works with Shimano™ 10/11, Campy 10/11, SRAM 10/11 drivetrains Not compatible with 4-arm Campy or 4-arm SRAM Exogram cranks Designed for traditional 5-arm 110BCD cranks We highly suggest KMC, Shimano™, or Campy chains GREAT for use with Di2 or EPS systems Power2Max, SRM, and Quarq power meter compatible