IN FOURS OR TWOS?
Ideally, the four wheels of a vehicle should be fitted with identical or at least similar tyres (in twos).
Some guidance on changing tyres:
- always change your tyres in twos or fours: it is essential that the tyres on a single axle are absolutely identical: same brand, same tread pattern, same dimensions, same ratings (speed and load);
- Always try to use the dimensions approved by the vehicle manufacturer (keep modifications to a minimum, or seek professional assistance);
- always fit the newest tyres to the rear axle to reduce losses of grip, whether it is a two or four-wheel-drive vehicle or rear or front-wheel-drive vehicle. Grip losses are very difficult to control at the rear.
BFGoodrich strongly recommends that you respect the sizes approved by the vehicle manufacturer. However, it is possible to change the size of the tyres you fit to your vehicle, but in this case it is vital that you seek the assistance of a professional
WEAR, PUNCTURE, REPAIR
You are strongly recommended to check the condition of your tyres at least once a week. Once a month, check their pressure, groove depth, and check whether they are showing signs of sidewall damage or any other signs or wear. If you are in any doubt, do not hesitate to ask a professional to confirm they are roadworthy.
Five reasons to change your tyres
Five reasons why you need to change a tyre. While a tyre may be repairable is some instances, before any repair it must be meticulously checked by a professional. Only he or she can confirm that it has not sustained any internal damage. A tyre must be removed before you can judge its condition accurately.
1 -The tyre is punctured
If punctured, your tyre must be examined by a professional. Only he or she can ensure that the inner tube has not sustained damage that makes the tyre irreparable.
2 - The legal wear limit has been reached
The French Highway Code states:
- "The 1.6 millimetre wear mark indicates the minimum legal rubber height".
- "The difference between the depth of the main grooves of two tyres fitted to the same axle must not exceed 5 millimetres".
3 - The tyres show signs of ageing
It is difficult to specify how long tyres can be used for. It does not depend on the date of manufacture. Tyres that have not been used much or even at all can show signs of ageing. Several factors can affect the lifespan of tyres: weather conditions, storage and usage conditions, load, speed, inflation pressure, maintenance, etc. Each of these can considerably alter the expected lifespan. For more information, see our advice on use and safety.
4 - The tyre is damaged
A kerb, pothole or blunt instrument can do serious damage to a tyre. Any perforations, cuts or distortions must be examined carefully by a professional mechanic. Only he or she can tell you whether the tyre is repairable. As a general rule, note that you must never drive with a damaged tyre or one that has run flat without consulting a professional. This is a safety rule because it is only after the tyre has been removed by a professional that he or she can confirm whether the tyre has sustained internal damage.
5 - The tyre shows signs of abnormal wear
Abnormal tread wear - located in patches, in the centre or on the shoulders - is often a sign of a mechanical problem such as misalignment or a balancing, suspension or transmission problem. It can also be the result of unsuitable tyre pressure. Contact a professional if you note the slightest abnormality.