Model 40T or 42T or 44T or 46T or 48T or 50T or 52T or 54T, Offset -1.5mm or 56T, Offset -2.3mm or 58T, Offset -2.3mm Offset, mm 0 (40-52T), -1.5 (54T), -2.3 (56T-58T) 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 Ultegra 8000 Weight, grams 95 (40T), 96 (42T), 98 (44T), 113 (46T), 116 (48T), 132 (50T), 144 (52T), 156 (54T), 168 (56T) Chain compatibility 10/11/12-speed chains : including Shimano HG+ and SRAM AXS flattop (incl. T-type) chains Color Black or Blue or Gold or Green or Orange or Red or Silver or Violet