A revolutionary construction for unrivalled performance
With its X tyre with radial casing plies, Michelin set out to conquer the world With a considerable advance in technology. Its revolutionary construction for the time had the special feature of separating the sidewall function from the crown function.
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.
The advantages of the radial tyre compared with the cross-ply tyre could be clearly seen in all areas :
- Greater safety (road-holding, grip, braking)
- Economical to use (double the mileage, considerable reduction in fuel consumption)
- Increased comfort thanks to the flexibility of the sidewalls. In the Fifties, the superiority of the X tyre was such that a number of racing drivers adopted it, although Michelin was not officially involved in any racing.
||145 R400 79S
|Tyre load index
|With/Without Valve (TT/TL)
||Tyre requires tube