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- CNC machined 7075 aluminum direct mount ring with tall, narrow-wide tooth design \n- SRAM licensed X-Sync design prevents chain drop without using a chain guide\n- Fits SRAM S2200, S2210, X9, X0, X01, XX1 and Truvativ AKA GXP cranks\n- Compatible with 10/11 speed chains, allowing a 1x setup on most any drivetrain