The tyre width in millimetres, measured from one sidewall edge to the other sidewall edge.

The tyre profile height is given as a percentage ratio to the width. In this case, the height is 55% of the width (205 mm), namely 112.75 mm. The profile height is often referred to as the series. In some tyre sizes the series number is omitted, for example 185 R14 C 102 Q. Such tyres are called full-profile tyres, and in this case the height-to-width ratio is 80% or 82%.

The inner diameter of the tyre. The same as the wheel diameter in inches.

The tyre load index indicates its maximum load capacity.

Load index ( LI - Load Index) is a numerical code associated with the maximum load that a tyre can carry.

Speed index ( SI - Speed Index) indicates the maximum permissible speed at which the manufacturer guarantees the tyre will retain its intended performance characteristics.