Campagnolo chorus 11 speed road cassettewith specially optimised sprocket teeth to give you fast and fluid shifting, the chorus cassette will ensure you get the best from your campagnolo drivetrain. This 11 speed road cassette benefits from campagnolos advanced construction features to give you the edge on race day. These include three sets of large pinions that are mounted on an aluminium frame, which increases rigidity by 180% and makes each sprockets resistance to torsion by 70%. The result of this is consistent and durable shifting performance even when youre sprinting or climbing.reasons to buy fast and fluid shifting. Ready for racing. Increased rigidity. Consistent and durable.features speed 11 speed use road compatibility 11 speed campagnolo derailleurs and campagnolo type freehubs steel with nickel chromed finish light alloy supports for the final two triplets 11s timing 11s tooth machining 11s light alloy lockring, thread 27x1 revised tooth design weight 236gmanufacturer reference codes 12 29t cpb518 12 25t cpb511 12 27t cpb514 11 23t cpb510 11 29t cpb517buy campagnolo components from chain reaction cycles, the world's largest online bike store.