The first major innovation from Michelin, the radial tyre was first marketed as the "X" tyre in 1949. At that time, Lancia was the first car manufacturer to fit the X tyre as original equipment on the Aurelia model. From 1955 onwards, radial technology became more popular and the majority of European car manufacturers opted for the radial solution. The X could be fitted to cars of very different categories, from the original and popular 2 CV or Beetle to the fascinating Mercedes 190SL or Facel Vega.