The rules connected with winter aren’t so obvious. There are some important facts which we won’t get to know on the Internet or in the ordinary garage. When the temperature is under seven degrees winter tires are much better than summer ones. Especially when it comes to the wet surface on the road. Then abilities to brake efficiently is much easier when our car is equipped with winter tires. It is recommended not to change tires for winter when the temperature is under seven degrees and when it’s dry because of the road holding. Some experts claim even when the temperature is below zero but it’s still dry summer tires react better. It is connected with tread heating while braking and its high temperature even in the frosty day. However the situation change in the wet weather when water is cooling the tread. When the temperature is seven degrees then it doesn’t matter if we have summer or winter tires. However when there is seven degrees below zero then winter tires are much better. All in all experts proved that it’s better to change tires for winter ones when the temperature is getting down. Thanks to it we will gain shorter braking distance and general safety.
Have you ever seen a sigh M+S on the tire?
Many people believe that it means that such tires is winter. It’s not true. At the beginning this sign M+S meant Mud@ Snow. However American companies started putting this sign on the tires for off-road vehicles not only on the winter ones but also on the summer too. Nowadays when we want to recognize which tire is winter we should look for a sign which look like small snowflake on the against the mountain. Remember that sign M+S doesn’t mean that it’s winter tire to make sure find this snowflake. Additionally, for the typical winter tire ice is very difficult to work properly. When there is an ice on the road such surface is slippery so that the road holding is much worse. In such situation for proper road holding is responsible adhesion phenomenon between the gum and the ice. This phenomenon works more efficiently when there is less cuts on the tread. The best idea will be to use such tires which are used in the car racing for example.
In addition, which tire can be called “winter”?
We can name tire “winter” when it meet three conditions. First, the distance between the cuts on the tread should be shorter than 10 mm. Secondly, rigidity of the gum shouldn’t be more than 65 Shore. Thirdly, the depth of the tread should be 4 mm or more. First condition is meet when the cuts are small and zigzag. The low rigidity of the tire is possible thanks to silica in the tire. It helps to keep the tire not so rigid even in the extremely low temperatures. Be careful with the tread and make sure that it’s still not too low when there is less than 50% of it you need to think about new tire. It’s not a problem to create a good tire for driving only on the snow. Much more difficult is to create a tire which will be good both for snow and for asphalt because there are different physic phenomenon . The best tire are those which provide your car with good road holding in different weather or road conditions. For instance Scandinavian tires are optimized mainly on the snowy surfaces and they don’t cope with dry or wet road as well as our tires. So that they can’t be called “better”. Some people believe that the more narrow tires are the better is road holding. However it’s not true. There is no evidence for that. In contrast wider tires provide shorted braking distance and bigger driving force. Some tests also showed that wider tires brake better on both wet and dry surfaces and they have better road holding on the bends. Moreover, it’s hard to admit which tread is better: directional or ordinary one. However, in the cars with higher performance the best tread is asymmetrical one. Furthermore, we can be surprise but the snow which sticks to the tread has an influence on the better road holding. In contrast mud is not so good. So called adhesion snow-snow cause better holding and is important. All in all, there are many facts which we get to know about winter tires and we can easily get misunderstood. Summary It seems that there are some facts connected with winter tires which can be surprising.