Model 40T or 42T or 44T or 46T or 48T or 50T or 52T or 54T or 56T or 58T Chainring shape Oval Offset, mm 0 (40T-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 130 BCD (5-bolt) Weight, grams 53 (40T), 63 (42T), 61 (44T), 72 (46T), 89 (48T), 109 (50T), 115 (52T) 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