Tyre Markings Meaning

Tyre Markings Explained

1. Tyre Sizes

The tyre size is composed of four numbers, such as 205/55/R18 105V, which indicate the tyre’s width, sidewall height, construction type, and wheel rim diameter.

  • 205 – the tyre width in millimetres
  • 55 – indicates the tyres sidewall height as a percentage e.g. 55% of the tyre width
  • R – indicates that the tyre is of radial construction
  • 18 – the wheel rim diameter measured in inches.

2. Mounting Direction

Asymmetric tyres have a specific indicator that shows which side of the tyre must face outward. Directional tyres have a marker to indicate the required direction of rotation.

3. Maximum Load and Pressure

Tyres have a maximum load capacity and pressure limit, which are detailed in your vehicle handbook.

4. Tyre Pattern Name

Each tyre pattern is designed for different purposes, so it is essential to recognize the different types.

5. Materials

Tyre sidewalls may include information about the materials used and how the tyre was manufactured.

6. European ECE Type Approval Marks and numbers

These marks indicate that the tyre has passed all European safety standards, and the ‘S’ symbol indicates that the tyre meets EC noise directives.

7. Load Index

The load index indicates the maximum load capacity a tyre can carry, and it appears before the speed index letter. For example, a tyre size of 205/55/R18 105V means the tyre can carry 925kg.

Load IndexKilogramsLoad IndexKilogramsLoad IndexKilograms
652908045095690
663008146296710
673078247597730
683158348798750
693258450099775
7033585515100800
7134586530101825
7235587545102850
7336588560103875
7437589580104900
75387900600105925
7640091615106950
7741292630107975
78425936501081000
7943794670  


8. Speed Index

The speed index is the letter that follows the load index and indicates the maximum speed the tyre can handle.

Speed SymbolApprox MPH
Q99
R106
S112
T118
H131
V149
VR131
W168
Y186
ZR149

9. Country of Manufacturer

Tyre markings can also inform you of the country where the tyre was made.

10. Tyre Brand

The manufacturer of the tyre is identified on the sidewall.

11. Tyre Wear Indicator

Tread wear indicators are added to some tyres, with a marker set at 1.6mm. When the tread wears down to the indicator, it’s time to replace the tyre by law.

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