Wolf-Tooth Directmount Flattop Single Chainring 42Direct mount rings designed for SRAM cranks with removable spiders. This chainring is equipped with the patent pending Drop Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention. 5 spoke ring replaces the existing chainring and spider on 3 bolt GXP cranks Asymmetrical tooth shape for the best wear life, chain retention and mud clearance Fits SRAM S2200, S2210, X9, X0, X01, XX1 and Truvativ AKA GXP cranks 6mm