The sidewall of a tyre contains a wealth of information — if you know how to read it. Understanding tyre markings helps you order the correct replacement tyre, compare specifications, and understand the load and speed limits of your current tyres.
Let's take a typical tyre size: 205/55 R16 91V. Here is what each part means: 205 is the tyre width in millimetres. 55 is the aspect ratio — the height of the sidewall as a percentage of the width (so 55% of 205mm). R means radial construction. 16 is the wheel diameter in inches.
91 is the load index — this number corresponds to a maximum load capacity. 91 indicates a maximum load of 615kg per tyre. V is the speed rating: V-rated tyres are approved for speeds up to 240km/h (149mph). Other common speed ratings include H (210km/h), W (270km/h), and Y (300km/h).
The DOT code is also important. In the format DOT XXXX XXXX XXYY, the last four digits indicate when the tyre was manufactured — the first two are the week, the last two are the year. A tyre marked 2321, for example, was made in the 23rd week of 2021.
The EU tyre label — also found on the sidewall or as a sticker on new tyres — rates the tyre for fuel efficiency (A-G), wet grip (A-G), and external noise level in decibels. Look for A or B ratings for best wet grip performance.
When ordering a replacement tyre, always match the width, aspect ratio, rim diameter, and ensure the load and speed ratings meet or exceed the original specification. Our fitters can confirm the correct specifications from your vehicle registration if you are unsure.