* Narrow Wide tooth profiling ensures ultimate chain retention* Attaches as part of the RF Cinch system (using common Park BBT-22 bottom bracket tool) - allowing to switch between DM rings/spiders with ease* Hard-wearing steel with a corrosion inhibiting coating* Offers indentical chainlines to existing aluminum chainrings and can be "flipped"* Compatible for 9, 10, 11 and 12 speed.