The reduction in rolling resistance has long since been one of the main objectives in the development of modern winter tires. The tire engineers at Continental have focused their attention on the products in the ContiEcoContact range. After all, the Hanover-based company has sold 160 million of them as original equipment and replacements over the past 15 years. They have managed to reduce rolling resistance successively from one model to the next, so that it is now some 20 per cent lower than in the tires prior to the launch of the Eco range. Development has now moved on to the third generation model, and the previous virtually irreconcilable development conflicts between "low rolling resistance" and "grip on a wet road surface" have been resolved to a much higher degree.

"As a result of our continued development work, there is no longer any difference between summer and winter tires in terms of rolling resistance," points out Dr. Burkhard Wies, Vice-President, Tire Line Development Worldwide at Continental. "In some of our models, the rolling resistance coefficient of around 1.0 cr in winter tires is even slightly lower than in their summer counterparts." Therefore, Dr. Wies has a simple explanation for the higher fuel consumption that many cars experience in winter; by necessity, it takes the engine longer to warm up in winter than in the summer. As a result, higher fuel consumption in unavoidable. His advice is that if you want to do something good for the environment, you should definitely have winter tires fitted and, if at all possible, walk occasionally, despite the poor weather.

Modern winter tires have fine tread structures in order to interlink well with the road surface on snow which has become compacted by cars or on icy surfaces. A huge number of grip edges form. This is thanks to the large number of fine, angled incisions, so-called lamellae, on their tread blocks. At the same time, the spacing between the profile blocks still has to be big enough to disperse water quickly when driving in the rain, but not so coarse as to compromise on flexibility. Treads designed in this way experience barely any more deformation in contact with the ground than modern summer tires.

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SOURCE: Continental Tire