Tyre sidewall markings

  • How do I read the sidewall markings of a track day or road tyre?
    For road tyres, refer to "Understanding tyre markings".
  • How do I read the sidewall markings of a motorsport tyre?
    Motorsport tyres use a different size designation to road tyres. Taking a rally tyre of size 20/65-18 as an example; 20 corresponds to the width of the tyre tread in cm, 65 to the Overall Diameter in cm and 18 to the rim diameter in inches.
  • How do I find the manufacturing date on the sidewall of a road tyre?

    This is contained in the last 4 numbers of the DOT code. The first two of these 4 numbers indicate the week of manufacture, the last 2 the year of manufacture. A DOT code ending in "1310" therefore corresponds to a manufacturing date during the 13th week of the year 2010, i.e. March 2010.

    Understanding tyre markings

  • Are there any differences between tyres with the “N” mark of approval, and those without? If so, what are they?
    Yes, there are – particularly with a manufacturer like Porsche, who we work in partnership with. In some ranges, tyres marked with the “N” will feature a different tread to those without it. This is the case with the Michelin Pilot Alpin 4. It also works in the opposite direction too. Looking at the latest tyre developed for Porsche, the Michelin Pilot Sport Cup 2, the market will benefit from the fact it has been designed in conjunction with the manufacturer.
  • How do road tyre and motorsport tyre dimensions relate?
    The marking system is different for road and motorsport tyres, which makes the notion of equivalence difficult. For example, the dimensional equivalent of 20/65-18 in WRC is 225/40-18 for a road tyre.


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