Model 28T or 30T or 32T or 34T or 36T Chainring shape Oval Offset, mm 6.4 (28-32T), 5.1 34T, 3.9 (36-38T) Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Ovality 12% Timing 108° after TDC (top dead center) Compatible cranksets Shimano M9100, MT900, M8100, M7100, M6100 Weight, grams 47 (28T), 53 (30T), 57 (32T), 62 (34T), 68 (36T) Chain compatibility Compatible with all 9,10,11-speed chains, 12-speed SRAM Eagle and T-Type, KMC, Shimano HG+ chains. Color Black or Blue or Gold or Green or Orange or Red or Silver or Violet