Changing tyres at 7 degrees - truth or fiction?

  • Author: OPONEO.CO.UK

Is it true, that the winter tyres should be installed when the temperature drops below 7 degrees?
Yes.

Read more – when should I install my winter tyres?

Why do some people claim that the “7 degrees rule” is a lie?
Some drivers say that the “7 degrees rule” is a marketing ploy to increase the sales of winter tyres.

Where did this claim come from?
The claim that the “7 degrees rule” is false appeared as a result of a test in the “Stern" weekly magazine (48/2005). The study has shown that summer tyres have a shorter braking distance in temperatures between 0 and +7 than winter tyres.However, this does not contradict the “7 degrees rule”.

How should I interpret the results?
It should be stressed, that the test didn't show that all winter tyres have a longer braking distance than the summer ones.The test has shown that in certain conditions, certain models of summer tyres had a shorter braking distance than certain winter tyres.As a finished product, a tyre is a compromise of performance characteristics.Some tyres have longer durability, while other have netter grip.

There are winter tyres that will perform well on dry surfaces in temperatures as high as 10 degrees.Similarly, there are some summer tyres that will provide safety in a temperature of zero degrees.

7-degrees-rule-080

7 degrees rule

Why do some summer tyres perform well in lower temperatures?
An addition of silica in the rubber mix of a winter tyre ensures that it retains its elasticity in low temperature.Silica can also lower the rolling friction and that is why it is sometimes used in summer tyres, which makes them keep their grip below 7 degrees.

Learn the construction and functions of the tyre elements.

Why should I use winter tyres?
Because winter tyres use numerous technical solutions that enhance their safety in the winter - such as special tread patterns, more sipes, higher tread, etc.

And what if the 7 degrees rule is a marketing ploy?
This is a logically false claim.It would be easier and cheaper for the tyre manufacturer to produce a single type of tyre.This would reduce the costs of manufacturing seasonal tyres.And the number of tyres sold would not change.Driving all year round on just one set of tyres, we would have to buy new tyres just as often.By producing just one type of tyres, the income would be higher, as the cost of production would drop.

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