If the X was revolutionary in tyre terms, the XAS was the next great leap forward for Michelin. Michelin boffins worked out that different areas of the tyre have entirely different roles, so designed the XAS to reflect this. The result is a tyre with much-improved stability, grip and road holding and it has one of the best-looking tread patterns you can buy. There are twelve sizes in the XAS range with some sizes having a FF (Formula France) version with a softer, grippier compound. This 175HR14 fits the NSU RO80, Volvo 244, Peugeot 504 coupe and cabriolet, Citroen CX, Peugeot 504 Coupe and 505, Triumph Stag, BMW 2000, 2500 and 3.0 CS, Fiat 1400, 1900 and 2300, Mercedes 230, 240, 250 and 300D, Nissan/Datsun 240Z 260Z, Toyota Celica ST and Corona.