printable version

Wheels and tires

Tires and wheels (on disk wheels) are important elements of car design.

Installation and repair of tires requires special tools and skills. These works may only be performed by professionals.

For reasons of safety, it should be possible to change a tire, not individually and, at least along the axes. Less worn tires must always be placed on the front wheels.

All four wheels should have only radial tires of the same design, the same size (the same circumference) and possible execution of the same tire.

In the presence of the tread pattern, which determines the direction of rotation of the tire on the sidewall of the tire are arrowheads.

In this case, you should strictly observe the direction of rotation of the tire. This provides optimal driving performance tires, its grip on the wet road surface and reduces wear and noise generated by the tire. When replacing punctured wheel is temporarily set with the rotation of the tire against a given, then its use in this mode should be short-lived.

Four wheel drive, in addition, all tires should be the same model of the same manufacturer.

Otherwise, the visco-coupling of the emerging differences in speed both axles is not desirable to raise the proportion of thrust attributable to the rear axle. This can lead to breakage.

Various tread depth of tires of front and rear wheels, for instance as a result of wear is not as important. However, it is recommended to set the tire with a greater tread depth on the front wheels when the front wheel tires are worn more than the rear tires, they have a smaller circumference and rotate so quickly. Therefore, there are additional stresses in the drive train and the tires wear out faster.

If the tire spare wheel in its performance differs from the other vehicle tires (e.g., winter or wide-) the spare tire is to be used only briefly in the event of failure of one of the tires of a vehicle and at the appropriate precautionary driving. Instead of the wheel should be as soon as possible to establish again the old wheel.

Never put a used tire on the car, if it is not known where and how it worked before.

Radial tires have on the tire sidewall marked as follows, for example, 195/65 R 15 91 T, where:

195 = section width in mm;
65 = the ratio of height to width of the tire profile%;
R = location of the carcass cords - letter designation for the radial tire;
15 = diameter of the disk rim, inches;
91 = index of the load bearing capacity;
T = speed index.

Release date is also specified on the tire sidewall (in some cases only on the inner surface of the tire) - DOT CUL UM8-507 TUBELESS, where:

DOT - manufacturer;
CU - a code mark of the manufacturer;
L2 - the size of the tire;
UM8 - type tires;
507 - manufacturing date (Week 50 1997);
TUBELESS - tubeless tire (TUBETYPE - chamber).

Marking wheels 6J x 15 is interpreted as follows:

6J - width of the disc in inches;
J - the height of the edge of the disc board;
x - a deep drive;
15 - boarding disc diameter in inches.