- Compatible with Shimano HG style hubs - Cogs are designed with narrow-wide alternating tooth pattern allowing for superior chain retention - Fits 9,10 and 11 spd chains, 12spd chains (SRAM Eagle, KMC, SRAM Road and Transmission T-Type Flattop chains) - Will not work with 13spd Campagnolo chains or 12spd Shimano HG+ chains - Wide cog base helps avoid damage to freehub body