Model 50T or 51T or 52T or 53T or 54T or 55T or 56T or 57T or 58T or 59T or 60T or 61T or 62T or 63T Chainring shape Round Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Compatible cranksets 144 BCD (5-bolt) Weight, grams 112 (50T) 119 (51T) 125 (52T) 131 (53T) 135 (54T) 141 (55T) 150 (56T) 156 (57T) 165 (58T) 172 (59T) 180 (60T) d (60T), 189 (61T) , 197 (62T) , 206 (63T) Chain compatibility Standard Color Black or Blue or Gold or Green or Orange or Red or Silver or Violet