Thermal snow tires
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To avoid taking risks and accidents are therefore advised to use one of these two systems. Chains can be used only when there is snow on the road and should be mounted every time as needed. The tire temperature, or more technically winter tires, mount the tire instead. Beginning in winter and taken down after the bad season. The wheels are different from traditional winter because their compound contains a high percentage of silica, which provides better adhesion to the asphalt even at low temperatures, around 6 or 7 degrees Celsius. The silica compound that participates in winter makes the wheels of rubber “tenderness” adequate to be able to hold the road better.
Obviously not all winter tires are the same: the best ones are marked as M + S are the initial letters of the words Mud + Snow, namely mud and snow, these are best suited to unpaved ground, and irregular. In addition to this symbol also appears accompanied by a mountain logo of a snowflake, which are to indicate adaptability to mountain roads. Tyre is also indicated the width of the tire in millimeters, for example 205, the rim diameter in inches, for example 16 and the height of the side in the width in mm, eg 55.
Knowing these numbers is important when you want to buy winter tires because we must follow those parameters listed on the registration document.
There are other tires on the season: the summer and winter Run flat. Being equipped with a rubber reinforced side wall, the Run Flat, allows you to walk even if you speed around 100 km at 80 km / h so as to reach the nearest tire.
M + S tires
The winter tires are classified internationally with the initials M + D as we have seen means Mud and Snow. The silica compound which allows the tires to remain soft even at lower temperatures can take the snow and make it compact between the road and rubber.
If snow tires put these in place of the operation differ depending on whether this is snow or ice. If the snow is fresh, the strong pressure exercised by the aggregation of ice crystals that make up the snow and the tire can get a grip on the road because the snow is in contact with more snow. If the road is this instead of ice, it triggers the action of the tires to strip, and these heating the tread, resulting in a temperature difference between ice and air, creating an adhesive effect. To be clear, the operation of rubber on ice can be useful to touch an ice cube with your finger and it will produce the same effect. Now many will ask what are the differences in structure between the normal and winter tires. Well, it certainly is a substantial difference in the design and tread pattern.
Consider the other components of tires. In addition to the strip which we have already seen what we are and what they are crossing the tread grooves and create designs swept wave or winter, unlike those of summer tires that are narrower and shallower. Plus winter tires have the compound composed of silica, as mentioned above, aims to maintain the soft tires, even at low temperatures, mixed with the rubber.
Regarding the design must be careful upstream from a possible rotation, ie all four wheels must be set in the same direction and must coincide with the direction. Do not be alarmed, it is difficult to mount because everything is fully explained in the instruction booklet supplied and should be read carefully before installing. Once mounted you must make sure that pressure is 0.2 bar higher than normal. In the spring when we take, we must take care to keep them away from direct sunlight and in cool places such as cellars and then if we wash before storing it even better.
Choosing snow tires
As we have seen the winter tires are very useful and important but it is also important to choose the most appropriate. The information necessary to provide the seller to buy winter tires that will make our case in the instruction booklet of car, where, however, will be written in code and abbreviations, so those who are not expert in the field will find it difficult to decipher and should seek help to tire.
In the booklet are first mentioned two fundamental information that is provided homologation measures and codes related to the speed. They are usually not binding, but you can choose between several measures, for example if we plan to use them on a layer of snow are often the result of subsequent snowfall and repeated, we should choose those that have a closer adherence increased, whereas if the soil is dry you can also use larger ones. The “code rate” requiring particular attention in the consultation: the law allows the use of tires with codes higher than indicated but not less. If you do not respect this rule will incur heavy fines. Below is a list of abbreviations and codes corresponding speeds:
* Letter Q: up to 160 km / h
* “R: up to 170 km / h
* “S: up to 180 km / h
* Letter T: up to 190 km / h
* Letter H: up to 210 km / h
* Letter V: up to 240 km / h
* Letter ZR: over 240 km / h
In addition to code for speed is also reported that a number indicates the maximum weight that the wheel can support, in technical terms the load too, as the code rate, provides a value higher than that reported in the booklet but not less.
Now, after choosing the most suitable tire for your car, remember that driving on ice is always dangerous, so you must travel at a speed exceeding 50 km / h. And good idea to check on cm of snow on the road to go before you start driving. Although winter tires are very effective, their function is in vain when the snow exceeds 20 cm and is a danger that the car remains stuck in the snow. If this happens we have to assemble the chains because they are more traction and trying to shovel the greatest possible amount of snow that lies beneath and around the car.
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