WOLF TOOTH - DIRECT MOUNT CHAINRINGS FOR SRAM CRANKS 9, 10, 11, & 12SPD EAGLE - THESE CHAINRINGS ARE DESIGNED TO WORK WITH ALL 9 SPEED, 10 SPEED, AND 11 SPEED CHAINS. THEY ALSO WORK WITH 12 SPEED EAGLE AND 12 SPEED KMC CHAIN. THEY DO NOT WORK WITH SHIMANO 12 SPEED HYPERGLIDE+ CHAIN OR SRAM 12 SPEED FLATTOP CHAIN. IF USING A 9-SPEED DRIVETRAIN USE A 10-SPEED CHAIN. IT FITS TIGHTER FOR BETTER CHAIN RETENTION Not suitable for SRAM Transmission crank arms (they require SRAM 8-bolt chainrings)