Narrow Wide tooth profile for better chain retention . 5x110mm BCD ring are compatible with 110BCD spider-based power meters such as Power2Max, SRM and Quarq. 3-bolt SRAM DM version has 45.5mm chainline on DM road, 48mm chainline for GR 1x Praxis cranks. In rough terrain, or just for security, use of an upper guard is still recommended. Compatible with 1×10/11/12sp Shimano, KMC and SRAM regular or Flat Top chains. Not compatible with Campagnolo 10/11/12/13 speed . Unauthorized online sales prohibited by manufacturer