These chainrings are f or Easton or Race Face Cinch cranks. Updated tooth profile works with SRAM Flattop chain. The Wolf Tooth Cinch chainrings feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Compatibility Easton Cinch™ cranksets including EC90SL Works with SRAM Flattop chain Wolf Tooth's patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability [snippet name="DropStop B"] Recommendations If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Related Products Easton Elliptical Chainrings GCX and GC cassette expanders Tech Specs Weight: t • 113g  |  46t • 129g  | 48t • 139g | 50t • 149g 7075-T6 aluminum Material: Made in the USA Patent and trademark information