Changing tyres: what's forbidden, what's recommended
The choice of replacement tyres is not entirely free: you are obliged to respect the highway code and the manufacturer's recommendations.
What the law prohibits
The rules of the road prohibit the fitting of tyres of different structures on the same axle. This means that the tyres must be:
- of the same dimension;
- of the same category of use (e.g. road, snow, off-road);
- of the same structure: radial or diagonal;
- of the same speed rating;
- of the same load-carrying capacity.
Tolerance for winter tyres
For winter tyres, the speed rating may be lower than that of summer tyres. Winter tyres are subject to lower driving speeds than summer tyres due to the weather conditions.
Respect the specifications approved by the manufacturer
The manufacturer's approval on your vehicle presents the specific characteristics of your tyres: width, height, diameter, load carry capacity, speed rating. This data is shown on the tyre sidewall.
When you change your tyres, you must use tyres with the same technical characteristics as those fitted originally .
However, the law allows a difference in dimensions of originally fitted tyres in some cases:
- If the original tread circumference is respected (tolerance + 1.5 %; -2.5 %);
- if load and speed ratings are equal to or greater than those of the original tyre.
Articles in the same header
- Heat wave: safety tips for your tyres
- After how many years should tyres be changed?
- How to measure tyre wear
- Spare wheel: don't forget the fifth wheel on the wagon!
- Check your tyres before you go on holiday
- How to identify abnormal wear
- Switch your tyres around at least once a year
- When do I change my tyres?
- Tyre pressure: to be checked once a month
- Tyre balancing and alignment