We're excited to expand our CINCH system compatibility with the new FLT 12 SPD direct mount chainrings. With sizing from 36 “ 44t, our directionally shaped tooth design is optimized to work with Flattop 12 speed chains and the X-Range (from 10-26t to 10-36t) cassettes these systems ship with. While the design is optimized for Flattop chains, these chainrings will also work with 11 speed chains. FEATURES Material: EA90 Alloy. Finish: Matte Black on Matte Black. Easton CINCH Crank Systems: EA90 and EC90 SL (Also Race Face compatible). Sizes: 36t, 38t, 40t, 42t, 44t. Optimized for: Flattop 12 Spd. Compatible with: Eagle 12 Spd, Shimano 11 Spd, Campagnolo 11/12 Spd.