If the front tires are noticeably worn, it is recommended to replace them with the rear ones.
When replacing tires, always install the less worn tires at the front.
When changing wheels, be careful not to damage the paint finish on light alloy wheels.
Tighten the wheel mounting bolts gradually in a crisscross pattern.
Running in tires. New tires have a smooth outer surface, so the tires are run in. The initial wear during the run in makes the tire rougher.
The first 200 km of the car's run should be driven very carefully (especially on wet surfaces).
Wheel balancing is carried out to compensate for uneven weight distribution. When driving, the imbalance makes itself known in the form of vibration, which is transmitted to the steering wheel. Vibration of the steering wheel from wheel imbalance appears in a certain speed range and disappears when the speed decreases or increases. Wheel imbalance can lead to damage to the steering joints and shock absorbers. It is necessary to balance the wheels after 20,000 km of the car's mileage or after any tire repair.
Anti-skid chains. The use of chains is permitted only on the drive wheels. The chain is allowed to protrude above the surface and from the inside of the wheel by no more than 15 mm. The maximum speed with chains is 50 km/h. On roads without ice, snow and mud, chains must be removed.
Spare wheel can be installed on both the front and rear axles. The car is equipped with a full-size spare wheel.
Checking tire pressure. Check your pressure (Table 14.3) only in cold tires.
Frequency of inspection - once a month or when servicing the vehicle.
It is advisable to check the pressure before long trips, as this is when the maximum temperature load on the tires is reached. When driving long distances at high speed and with low tire pressure, more energy is spent on the deformation of the tire, as a result of which it overheats and the separation of the profile layer or even the tire groove may occur.
Checking the tire tread depth. Intensive wear of tires is caused by a sporty driving style, intense acceleration and sharp braking.
Note: The tires can be used up to a tread depth of 1.6 mm (the depth of the profile grooves over the entire surface of the tire must be at least 1.6 mm). However, for safety reasons, it is recommended to replace tires when the tread depth is 2-3 mm.
On snow, M+S tyres provide sufficient grip with a tread depth of at least 4 mm.
The tire should be examined for cuts and their depth should be determined. If the cuts reach the cord, the steel cord will corrode from penetrating moisture.
The valve is checked in the following order:
- unscrew the valve cap;
- apply liquid to the valve so that it fills the cavity of the valve;
- When a bubble forms, tighten the valve with the back of the cap using a special key for unscrewing and tightening the valve:
- recheck the valve in the manner described. If bubbles continue to form and the valve cannot be screwed in, replace the valve or the valve assembly with the valve;
- Screw the cap onto the valve.
Checking the radial and lateral runout of tires. Hang up the corresponding car wheel.
Place the measuring tip of the dial indicator first on the working surface and then on the side surface of the tire.
Turn the wheel slowly with your hands, while reading the indicator. Mark the places on the tire with the maximum indicator deviations with chalk.
Checking the radial and lateral runout of the discs. Fix the disk without the tire on the axis of the balancing device. Set the measuring tip of the dial indicator first on the radial and then on the lateral inner surface of the disk, on which the tire bead rests (Fig. 14.5).
Fig. 14.5. Surfaces for measuring disk runout:H - radial runout; S - lateral runout
Note: Maximum runout of a steel wheel: H = S = 1.2 mm. Maximum runout of an alloy wheel: H = S = 1.0 mm.
Slowly rotate the balancing device disk with your hands, while simultaneously reading the indicator. Do not take into account deviations of the indicator arrow from local protrusions or depressions on the disk.
If the maximum runout value is greater than the specified values, replace the disc.
Tire pressure*, kPa
Table 14.3.
Tire size | Front wheels | Rear wheels | ||
up to three people in the cabin | full load | up to three people in the cabin | full load | |
165/80 R14 | 200 | 220 | 200 | 220 |
185/65 R15 | 190 | 210 | 210 | 230 |
175/70 R14 | 200 | 220 | 210 | 230 |
* The pressure indicated is for cold tires.