Built to outlast, this hard-wearing and corrosion resistant steel direct mount ring has a lifespan that is measured in years not months. 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. Compatible for 9, 10, 11 and 12 speed.