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Putting Winter Tyres to the Ultimate Test

Putting Winter Tyres to the Ultimate Test

By Swansway Motor Group 08-11-2018

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Acclaimed motoring journalist, John Swift, recalls driving in the arctic on winter tyres.

From Lapland to Luton and Liverpool - why winter tyres could keep you safe...

In all my years as a motoring journalist few things have been so graphically demonstrated to me as the benefit of winter tyres when I drove a standard Ford Mondeo up to Lapland in the Arctic Circle.

The Mondeo was exactly as it left the factory, save for one critical difference - it was fitted with winter rubber.

We drove in deep freeze conditions, way south of minus 20 Celsius, and many of the diesel cars in our little convoy broke down, if they weren’t using a special winter additive, their fuel quite simply turned to wax.

I vividly remember barrelling down ice covered roads at 40 or 50 mph with no more difficulty or caution than you would on a dry road, but then having to hold onto the bonnet as we changed sides for a driver swap, as otherwise we’d have slipped and fallen over, so little grip was there on the icy surface.

Beautiful icy road in Lapland at dusk

Nothing I’ve tried, seen, or heard about, in all my 30 years as a motoring journalist; including live airbag demonstrations, anti-lock brakes, skid control technologies and even self-controlling vehicles, has left such a deep impression on me as the difference those winter tyres made.

I’ve always thought it misleading to call them winter tyres when more accurately they should be called cold-weather tyres. I say that because `normal’ tyres start to lose their grip at 7 degrees – that’s seven above freezing not seven below, by the way.

Tyres get a large part of their grip by being flexible as the car accelerates, brakes and steers; the ingredients mixed into their compound `bite’ into the road surface. At that 7 degree threshold the tyre starts to become stiff, losing that flexibility and with it, a lot of its grip. Winter tyres have more silica and natural rubber in the compound to keep that flexibility.

If you want tragic proof that the cold makes rubber go brittle, think back to the Challenger Space Shuttle which exploded just after launch. The cause was later traced to a rubber gasket which had gone hard from the lower-than-expected temperatures the night before launch; this meant it could not contain the searing rocket gases as it should and indeed would have done, had it retained its flexibility.

But, that was a spaceship - do we really need them in this country, on our roads where harsh winters are the exception more than the norm? Are they worth the expense?

Silver car in ditch after accident due to snowy conditions

Well, look at it this way. Insurance figures show that we are six times more likely to be involved in a bump between October and March and while the dark may play a part, the cold plays a bigger one; and that’s a fact.

Consider too the advantages of using seasonal rubber that is engineered to keep you safe on cold and wet wintry roads.  One tyre maker, Continental, says a car on winter tyres will stop from 30 mph on a snow-covered road in 35 metres; on normal tyres the driver would need another 8 metres. That's another two car lengths, or the difference between being safe or slamming into the back of the car which has stopped in front of you; pulling up safely at a Give Way sign or overshooting onto a main road.

Since 2013 Continental has run free sessions at the Mercedes Benz World facility (the old Brooklands race track in Surrey) where drivers can try winter tyres for themselves. It’s surely telling that before the tests, 82% of those taking part had never experienced winter tyres, but afterwards 98% said the tyres were better than expected and 90% said they will probably now buy a set.

With a winter tyres starting at around £100 a tyre for a typical family car, there is a strong financial case for saying they make sense. There’s an even bigger safety case – and you don’t have to be driving in the Arctic to get it.


Why should you use winter tyres?

There's a lot of talk about winter tyres, but who really needs two sets of tyres and why?

  • the 7 degree rule - when the temperature drops to 7 degrees celsius or below, standard rubber tyres start to stiffen and become brittle
  • stopping distance - there's a marked difference in stopping distances, at lower temperatures, between standard and winter tyres
  • minimise skidding - winter tyres give excellent grip, even on ice, minimising the risk of losing control in a skid

 

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