The new Campagnolo Chorus 12-speed Cassette has been designed to optimize the speed and fluidity of shifting. Its innovative machining reduces stress on the chain, allowing it to ascend more easily onto the higher diameter sprockets and it introduces a new cassette specification (11-34) that will benefit the entire range of 12-speed mechanical drivetrains from now on. The new 11-34 cassette in fact offers cyclists even more versatility and greater choice and autonomy in terms of available gears. The larger cogs are divided into sets of three and are mounted on a new carrier, increasing the rigidity up to 180%, and individual sprockets are 70% more resistant to torsion. The steel sprockets have a Nickel-Chrome surface treatment for durability. You'll love the solid, precision shifting offered by the new Campagnolo 12-speed rear sprockets. 11-34T recommended for Chorus only.