Model  42T or 44T or 46T or 48T or 50T or 52T or 54T or 56T or 58T Color Black Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Timing 108° after TDC (top dead center) Chainring shape OVAL Compatible cranksets 130 BCD (5-bolt AERO ) Weight, grams 70（42T), 80(44T) ,9...