195 indicates the section width of a tyre in millimetres.

65 is a tyre’s aspect ratio which is its height from the base of the tread to the rim. This number represents a percentage of the tread width. For example, the height of this tyre is 65% of its width. Low profile tyres have smaller aspect ratio percentages.

Tyre Construction

R means that the tyre has radial ply construction, meaning the way in which it has been constructed. Most passenger tyres are constructed this way so you will rarely find a car tyre without an R.

15 indicates the diameter of the wheel rim. So if you are buying wheels for existing tyres, this is the size in inches you will require.

91 V is a symbol that indicates the maximum load capacity and speed at which a tyre can be safely operated, subject to the tyre being in sound condition, correctly fitted and with the recommended inflation pressure.

Overall Diameter of the unloaded tyre in mm

With regular tyres, a puncture generally means you lose steering control. It also puts you in added danger while changing the tyre on the roadside. With Run Flat Tyres, if your tyre gets punctured, there’s no sudden deflation – meaning you can continue driving safely. This is because the tyre’s thicker sidewall is significantly reinforced and made from heat resistant rubber. It can safely carry the weight of your car for a short period, despite a total loss of air pressure. Tyres with Run Flat Technology should only be fitted to vehicles that are equipped with a Tyre Pressure Monitoring System (TPMS).