Model 38T or 40T or 42T or 44T or 46T or 48T or 50T or 52T or 54T Offset, mm 2.8 (38T-54T) Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Ovality 12% Timing 108° after TDC (top dead center) Compatible cranksets SRAM Red/Force AXS Weight, grams 66 (38T), 72 (40T), 82 (42T), 91 (44T), 100 (46T) 109 (48T) 115 (50T) 122 (52T) 129 (54T) 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