To begin with, you need to determine the seasonality of the tire. It is necessary to strictly observe this parameter and "re-train" the car in the tires recommended by weather conditions. Wrong choice can not fully guarantee the car's behavior on the road, and therefore your safety.
Then find out the size of the tires you need. The required value can be found either in the technical passport of the machine or on the available tires on the side. Next, you need to figure out where you plan to go. If you are an average urban resident who occasionally makes trips to a picnic or to a dacha, then you will be perfectly fit tires of universal type. In the event that you are going to travel over difficult terrain, you can not do without off-road tires.
The speed index is another important indicator,which determines the maximum speed for each specific bus. In addition, it is also a symbol for the group. In the modern world, there are many different cars of various classes, ranging from relatively slow-moving oldtimers to racing cars of Formula 1. The speed index determines which tire can be used for a known value of the permissible loads. In addition, there are several unspoken rules associated with this parameter. For example, a car can develop a speed limit that is 10 to 15% less than the recommended one. The speed index (t, for example) shows the maximum permissible speed that the tire will withstand at normal load values. Excess in this case will threaten the tire out of service, which is more than unsafe. A long service life can ensure correct and careful operation of the tires.
The index "speed index" has severalfeatures. For example, the manufacturer stated that the maximum permissible speed for a given tire is 180 km / h under normal load. This means that short-term speeding up to 200 km / h will not entail serious consequences. Only prolonged wear at elevated loads can lead to overheating of the tire and its destruction.
The tire speed index is determined by the followingway. The test tire sample is tested on a special test bench by changing the parameters of the power and speed load. After carrying out a large number of measurements, the received data are processed. Then the average permissible speed (for example, 240 km / h) and the corresponding velocity index (v) are displayed.
The value of this parameter, recommended fora particular car, could previously be found on the side of the tire along with the other important and defining indicators. Now the manufacturers prefer to enter data of this kind in the vehicle's technical passport.
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