4.2.1. Description of tires
Tires of tubeless type
The tire ensures satisfactory functioning at the loadings which are not exceeding a full rated load with the recommended air pressure in the tire.
Normal pressure in the tire and the correct style of driving exert a great influence on a tire resource. The movement with a high speed on turns, excessively bystry acceleration and unnecessary intensive braking increase wear of a protector.
Plate of "tire"
The plate of "tire" settles down on the left rack of a door and contains information on tires. In the table data on the maximum load, the size of tires and pressure are provided in the cold tire.
Data on the size of a rim and/or the maximum load are provided if it is demanded by the legislation of the country where the car is operated.
Inflating of tires
Pressure in the tire recommended for any model pays off proceeding from reasons of comfort, stability, controllability, wear of a protector, a resource of the tire and resistance to damages.
Pressure in cold (after the car was in rest during not less than 3 h or passed less than one mile) to the tire it has to be checked monthly or before any long trip. Pressure in the tire is regulated according to data in the plate located on the left rack of a door.
Pressure in the tire increases when heating the tire at the movement.
Do not pit air from the tire after a trip.
At drain of air pressure in the cold tire will decrease.
Pressure increased in comparison with recommended in the tire can cause:
– increase in rigidity;
– damage of the tire or framework;
– bystry wear of the central part of a protector.
Unequal pressure in tires of one axis can cause:
– a drift when braking;
– deterioration in controllability;
– a deviation from the rectilinear movement at acceleration.
Pressure lowered in comparison with recommended in the tire can cause:
– squeal of the tire on turns;
– the increased effort on a steering wheel;
– bystry and uneven wear at the edges of a protector;
– damage and deformation of a rim;
– damage of a cord of the tire;
– overheat of tires;
– deterioration in controllability;
– the increased fuel consumption.
Selection of tires and disks (steel stamped disks)
At the plant of the tire approach disks, it means that the most rigid part of the tire in the radial direction, or "the high place", is combined with the site of a disk with the smallest radius or "the low place" of a disk.
It becomes to provide smoothness of the course.
"The high place" of the tire is initially noted by a paint 1 point on an external sidewall. This point of paint eventually is washed away from the tire (fig. 4.3)
|Fig. 4.3. Markings of "high and low" places of a wheel
"The low place" of a wheel is initially noted by a paint 2 point on the onboard zakrayena of a wheel. At the correct assembly, the point on a rim of a wheel has to be combined with a point on a tire sidewall, as shown in the figure 4.3
Every time when the tire is dismantled from a disk, it has to be repeatedly installed so that mutual position of the tire and a disk was not broken. If the tag on a sidewall of the tire is absent, before dismantle of the tire it is necessary to put adjusting tags on the tire and a disk that at the subsequent installation the tire was installed in the same situation.
Replacements of the tire
When replacement is necessary, installation of the tire of the same type is allowed. See the plate of tires. Again installed tire has to have the same size, an index of loading and a design, as the tire which is originally installed on the car. Use of the tire of any other size or type can affect riding qualities, comfort, indications of the speedometer / odometer, a road gleam of the car and a gap between a wheel and a body and the chassis.
It is recommended to install new tires by couples on one axis. In case of need replacements only of one tire, for one axis it is necessary to pick up the tire having the minimum wear of a protector for ensuring equality of brake efforts.
Do not install on the car of the tire of various type: radial and diagonal, except for critical cases because it can strongly change behavior of the car and lead to loss of control over the car.
In metric system pressure in tires is measured in kilopascals (kPa). On the plate of pressure in the tire it is usually specified both in kPa, and in psi. Metric tire manometers are on sale in shops of the autotool. In the table the translation of standard pressure from kPa in psi is given.