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Support ring on PAX wheels > < Construction of tyres with run-flat capability (PAX)

A4 Mk1

Codes and designations on tyres with run-flat capability (PAX)
Codes and designations on tyres with run-flat capability (PAX)
As compared to standard tyres, run-flat tyres (PAX) have different codes and designations on the sidewall. This makes it easy to identify run-flat tyres.
   
Codes and designations on tyres with run-flat capability (PAX)
245 - Tyre width in millimetres
690 - Tyre diameter (outer) in millimetres
R - Radial construction
500 - Nominal diameter of standardised rim seat
A - Construction type index for the wheels with run-flat capability (PAX); „A“ stands for asymmetric, since the two rim seats have different diameters.
99 - Maximum permissible load of tyre (99 = 1550 kg)
Y - Speed code („Y“ stands for a permissible top speed of 300 km/h).
  A44-10028

Support ring on PAX wheels > < Construction of tyres with run-flat capability (PAX)