- CNC machined aluminum ring fits Race Face cranks with Cinch System - Use 0mm Offset for T-Type and 3mm Offset for Boost and Super Boost applications - Features Drop-Stop tooth design to prevent unwanted chain drop - Asymmetrical tooth shape for the best wear life, chain retention and mud clearance - Drop-Stop B is compatible with 10/11/SRAM 12sp chain and Flat Top/Transmission chains. Not compatible with Shimano 12 speed - Made in the USA from 7075-T6 aluminum alloy
