How to Read Tires Numbers 5/5 (4)

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How to Read Tires Numbers – The tire’s flank contains all the information you will need on your tire. Here is a small guide with the meaning of all numbers and letters:

How to Read Tires Numbers
How to Read Tires Numbers

 

A. Tire width

The width of the tire, in millimeters, measured between the two flanks.

B. Ratio Height/width

This is the ratio of the cross-section of the tire with its width, expressed as a percentage. For example, a ratio height/width of 65 indicates that the tire height is 65% of its width.

C. Diameter of wheel

The diameter (height) of the wheel in inches.

D. Cargo index

The load index of your tire refers to the maximum load capacity (in kg). You will find the tire load index on the flank, next to the diameter.

For example, a tire with a load index of 91 can carry 615 kg.

Load and speed indexes should be verified when purchasing a new tire. Also, remember to consult the manufacturer’s recommendations.

E. Speed Index

The speed index is the maximum speed for a tire when it has the correct pressure and is used for cargo. The speed index is indicated by the letter at the end of the flank, after the load index number. For example, a tire with a V speed index has a maximum speed of 240 km/h.

When purchasing new tires, make sure that the respective speed index corresponds to the speed capabilities of your vehicle.

 

Higher load indices and different speed indexes

It may be possible to place tires with higher load indices and speed indices other than those indicated in the vehicle manufacturer’s documentation.

However, always check first in the vehicle manufacturer’s documentation if these tires can be placed on your vehicle and if the use of these tires is permitted by local laws and regulations. It must also comply with all applicable requirements of local laws and regulations and not exceed the specifications of these tires as well as those indicated in the vehicle manufacturer’s documentation for speed and cargo. Your dealer may help you check these aspects before purchasing or placing the tires.

Is it possible to put tires with a higher speed index than recommended by the manufacturer?

Yes, it’s possible. However, always check first in the vehicle manufacturer’s documentation if these tires can be placed in your vehicle.

Is it possible to put tires with a higher load index than recommended by the manufacturer?

Yes, it’s possible. However, always check first in the vehicle manufacturer’s documentation if these tires can be placed in your vehicle.

Is it possible to put tires with a higher speed index and a load index than recommended by the manufacturer?

Yes, it’s possible. However, always check first in the vehicle manufacturer’s documentation if these tires can be placed in your vehicle.

Is it possible to put tires with a lower speed index than recommended by the manufacturer?

Yes, it’s possible. You can use tires for all seasons or winter tires (M + S) with a lower speed index during winter, provided that:

A) is placed a sticker indicating the maximum speed limit in the driver’s field of view;

B) do not drive the vehicle at a speed exceeding the maximum speed limit. However, always check first in the vehicle manufacturer’s documentation if these tires can be placed on your vehicle and if the use of these tires is permitted by local laws and regulations.

Is it possible to put tires with a higher load index and a lower speed index than recommended by the manufacturer?

Yes, it’s possible. You can use tires for all seasons or winter tires (M + S) with a lower speed index during winter, provided that:

A) is placed a sticker indicating the maximum speed limit in the driver’s field of view;

B) do not drive the vehicle at a speed exceeding the maximum speed limit. However, always check first in the vehicle manufacturer’s documentation if these tires can be placed on your vehicle and if the use of these tires is permitted by local laws and regulations.

Warning

Refer to your vehicle’s owner’s manual to determine the load limits. The overload of your vehicle puts excessive pressure on the tires and other crucial components of the vehicle. It can cause bad driving performance, increased fuel consumption and tire failure. It can also result in severe cracks, separation of components or “bursts.”

 

Video How to Read Tires Numbers

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