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Reading a Sidewall

Tyre sidewall markings include information that is important when assessing whether certain tyres are suitable for specific cars.

Here we explain the most important markings. For assistance when choosing replacement tyres, contact your Toyo tyre dealer.

LOAD INDEX
& SPEED SYMBOL

The load index number and speed symbol correspond to the maximum load-carrying capacity of the tyre and its maximum speed capability.

DIAMETER

The diameter is the size of the wheel from one side to the other.

RADIAL

Tyres with an "R" indicate radial tyre construction.

ASPECT RATIO

The aspect ratio indicates the dimensional relationship of the section height to the section width.

WIDTH

The width indicates the widest point of a tire from sidewall to sidewall.

TYRE TYPE

Some tyres have a P or LT in front of the tyre width, identifying them for passenger or light truck use.

TREADWEAR, TRACTION,
AND TEMPERATURE GRADES

The UTQG code provides consumers with information on tyre treadwear, traction, and operating temperature resistance.

DOT TYRE IDENTIFICATION NUMBER

The DOT tyre identification number indicates compliance with all safety standards established by the U.S. Department of Transportation and provides additional information about the tyre.

MOUNTAIN

M+S designates a mud and snow tyre.

SNOW

The mountain/snowflake designate a tyre designed for severe snow conditions.

Tyre Brand

The tyre brand is also often, but not always the name of the tyre manufacturer.

'Toyo' on the sidewall of a tyre

Tyre Tread Pattern

The tread pattern can consist of a name, a number, a combination of letters and numbers or even a combination of a name and letters and numbers.

'Proxes T1 Sport' on the sidewall of a tyre

Tyre Size and Service Description

These two markings are usually located next to each other. The service description is made up of two parts, a load index and a speed rating.

255(Section Width)/35(Aspect Ratio)R(Casing Construction)19(Rim Diameter) 96(Load Index)Y(Speed Rating)

Formula for calculating section height:

Overall diameter - rim diameter / 2

Formula for calculating aspect ratio or tyre profile:

Section height ÷ section width x 100


To ensure suitability of a tyre construction type for your car, contact your Toyo Tyre dealer.