Model 30T or 32T or 34T or 36T or 38T or 40T Chainring shape Oval Offset, mm 2 (30T), 0 (32T-40T) 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 96 BCD Weight, grams 34 (30T), 36 (32T), 43 (34T), 53 (36T), 59 (38T) 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