The sidewall markings of a tyre such as the g-Grip above contain the following important information:
> Section width
> Aspect ratio
> Structure
> Rim diameter
> Load index
> Speed symbol
For example, a tyre marked 195/55 R 15 91H means:
195 Nominal tyre section width (mm)
55 Tyre aspect ratio (%)
ratio of the sidewall height to the section width
R Structure Radial construction
15 Nominal rim diameter in inches
91 Load index – indicates the maximum load capacity
(615kg in this case)
H Speed symbol – indicates the maximum authorised speed.
(131mph in this case)