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- Narrow-wide teeth prevent chain drop, updated tooth profile runs quieter \n- Durable 4mm thick 7075-T6 aluminum with reversible laser etched graphics\n- Compatible with 9-11 speed chains, allowing a 1X set up on most any drivetrain (works with SRAM 12sp, but not Shimano 12sp chains) \n- 30T rings are theaded for standard M8x0.75 chainring bolts