The diameter of the axle absolutely does not change the rotation speed of the wheels and has no impact on this parameter. In fact, the diameter of the wheels cannot change according to the rotation of the axle, whether it has a diameter of 50 mm or 40 mm. The only variable capable of affecting the rotation speed of the wheels is, quite simply, the speed at which the kart travels along a stretch of track. Considering that kart tyres are not radial (although it should be noted that many years ago some manufacturers also developed radial tyres for karts, which were later abolished by the regulations: read “Editorial | Kees van de Grint: The technical revolutions of karting (that never happened) ” to find out more, editor’s note), as the speed of the vehicle increases, even the diameter of the tyre slightly increases, which turns faster.
