A. The first three digits display the width of the tyre in millimetres; therefore a tyre marked 205 will measure 205mm across the tread from sidewall to sidewall.
B. The fourth and fifth digits of the tyre code that follow the tyre width show the aspect ratio or profile height of the tyre sidewall So an aspect ratio of 55 for example means that the profile height of the tyre is 55% of its width.
C. The next two digits represent the size of the wheel rim that the tyre can be fitted to. So, a tyre marked 16 will fit on a 16-inch wheel rim.