The racing zero has been redesigned for 2017 now 17 mm wide internally when combined with 25 or 28mm tyres the rim and tyre form a squarer profile which leads to less drag and better rolling resistance family legacy the racing zero competizione model takes all of the elements that made the racing zero such a fantastic and universally trusted wheel for racing and adds extra performance normally reserved only for top end carbon fibre models found under world tour riders gold standard the whee