Centaur Carbon Ultra-Torque Chainset Starting from this season, the forged aluminium alloy Centaur? Ultra-Torque? chainsets is joined by the Ultra-Torque? Carbon chainsets, in which the use of metal parts is extremely limited. Composite crankarms . Ultra?Drive? chainrings . Integrated ULTRA-TORQUE? semi-axles . Requires ULTRA-TORQUE? BB overboard cups Alloy chain ring bolts Weight from 693g (compact 170mm crank arm) Weight from 704g (standard 170mm crank arm) This chainset saves 120g over the standard alloy version