The 90 aero goes big offering ultra deep rim aerodynamics time trialists and triathletes love this wheel because the det rim profile reduces drag to a minimum effectively giving them an advantage over their competitors the 90 aero allows racers to go faster while expending less watts and like the similarly shaped rzr 92 it remains stable in gusty conditions allowing the rider to concentrate on putting down power and going for the win available in clincher only weight set 1875g s