We spent hours and hours in wind tunnels we studied the effects of rolling on the structure of the rim to make a wheel dedicated to the very essence of speed when average speeds are really high and every watt has to count the new 55 mm design is the latest response to the historic challenge of headwinds and attrition features the rim rim for tubular in 3k carbon 55 mm high with 242 mm section rim tubular contact well in 3k carbon for optimum resistance the braking track 3k car