Low frontal drag and crosswind stability mavic have used a 45mm deep naca profile to reduce drag in all conditons to combat crosswinds the 25mm external rim width perfectly intergrates with the supplied 25mm tyre to lower drag further and inspire confidence in steering to top it off mavic use patented elliptical spokes to enhance the aerodynamics of the wheel and make you faster in every section you ride perfect efficiency 17mm internal rim width offers low rolling resistance with 25m