Reading Your Tyre Sidewall

Check out our helpful guide below which will help you understand the meaning of the symbols on your tyre sidewall.

Reading your Tyre Size

Finding your tyre size is a relatively easy process, once you know how! Just use our simple guide below and enter the results into our website to get some of the cheapest tyres online!

Tyre size information can be found on the sidewall of your tyre, as seen in the image below:

This code is made up of the following 4 key tyre features:

Find the width, profile, rim size and speed of your tyre on the tyre sidewall

Width - The width of the tyre in millimetres.
Profile - Sidewall height a percentage of the tyre width.
Rim Size - The diameter of the tyres inner rim in inches.
Speed Rating - The maximum recommended speed for the tyre at full load.

What do all the other markings mean?

The markings on tyre walls are there for two reasons:

  • To indicate the size, specifications and properties of the tyre.
  • To show that the tyre has passed European safety standards.
Where to find all other tyre markings

1. Tread Wear Indiactors

This diagram shows the location of the tread wear indicators. They can be found in between the main tread grooves and are set at the minimum legal depth of 1.6mm. These features are not on all tyres but they act as a visual warning to indicate wear. They clearly show drivers when the tyre tread has reached the minimum depth and the tyre needs to be replaced.

2. Trademark

This identifies the tyre as being associated to a particular brand and product range.

3. Tread Pattern

The name of the tyre or the tread pattern is indicated on the sidewall so drivers know which product it is they have purchased. With so many tyre tread patterns available, they all need to be easily identifiable.

4. Tyre Section Width

The nominal width of the tyre’s cross-section is measured and displayed in millimetres. This makes up part of the all important Tyre Size

5. Type of Construction

The majority of all modern tyres are of radial construction. Cords in a radial tyre run perpendicular to the direction of travel. They run radially when viewed from the side, which gives the tyre its name.

6. Tyre Load Capacity Index

This is a code that refers to the maximum load the tyre can carry. This is based on the speed indicated by its speed symbol (see below). The below table is used to find load index details for each code.

Load Index Kilograms Load Index Kilograms Load Index Kilograms
65 290 80 450 95 690
66 300 81 462 96 710
67 307 82 475 97 730
68 315 83 487 98 750
69 325 84 500 99 775
70 335 85 515 100 800
71 345 86 530 101 825
72 355 87 545 103 850
73 365 88 560 103 875
74 375 89 580 104 900
75 387 90 600 105 925
76 400 91 616 106 950
77 412 92 630 107 975
78 425 93 650 108 1000
79 437 94 670

7. Speed Symbol

The speed symbol is a letter. This indicates the maximum speed at which the tyre can carry the load - this corresponds to the Load Capacity Index (above The below table can be used to find out specific speed ratings for each symbol.

Speed Symbol Approx MPH Approx KM/H
Q 99 160
R 106 170
S 112 180
T 118 190
H 131 210
V 149 240
VR 131 210
W 168 270
Y 186 300
ZR 149 240

8. Hight to Section Ratio

This shows the height of the tyres sidewall as a percentage. This makes up part of the all important Tyre Size

9. Type of Construction

Again indicates the tyre is of Radial Construction.

10. Manufacturers Marking

Commercial brand name and identity.

11. Rim Diameter

This stands for (in inches) the nominal diameter of the wheel rim that the tyre is designed to fit. This makes up part of the all important Tyre Size

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