Model: 42T or 44T or 46T or 48T or 50T or 52T or 54T or 56T or 58T Colour: Black Material: 7075-T651 Aluminum Alloy Surface coating: Anodizing Made with: CNC milling Ovality(Oval chainring): 12% Timing: 108° after TDC (top useless center) Chainring shape: Oval/Round Compatible cranksets: a hundred and ten BCD (5-bolt AERO) Weight: Round Shape: 95g(42T), 107g(44T) ,118g (46T), 134g (48T), 149g (50T), 161g (52T), 199g (54T), 202g (56T), 206g (58T) Oval Shape: 84g42T), 96g(44T) ,108g (46T), 120g (48T), 128g (50T), 140g (52T), 165g (54T), 180g (56T), 190g (58T) Chain compatibility: Standard 9/10/11/12 velocity is available, sram axs can't