The original narrow-wide chainring, machined for RaceFace's Cinch direct mount system. Built for Boost frames with 3mm offset. Sizes: 28T (50g), 30T (52g), 32T (54g), 34T (68g) Material: CNC-machined 7075 aluminum for long-term durability Finish: Type II anodized Chainline: 52mm, 3mm offset (Boost) Compatibility: The Race Face Cinch Round Chainring is compatible with the following cinch cranks: Next SL G4 Next SL Next R SIXC Turbine Atlas AEFFECT Ride Cinch Not compatible with Shimano HG+ or SRAM Flat Top chains.