With the additional sprocket on the cassette the need for a range of cassettes is eliminated. The extra gear allows for single tooth increments all the way up to the 7th sprocket. The cassette is an identical width to the 11-speed versions so they are compatible with all existing Campagnolo freehub bodies. When researching other 12-speed equivalents on the market, they found an incredible amount of flex due to the single ring set up of the cassette. Campagnolo’s are fixed to a spline to offer greater rigidity.