Audi A4 with 2001- 2005 of release.
1. Operation and car maintenance service
2. The engine
3. Transmission
4. A running gear
4.1. Wheels and tyres
4.1.1. The general information on wheels and tyres
4.1.2. Specifications for re-equipment of disks and tyres
4.1.3. Indexes of speed of tyres
4.1.4. Marks on disks
4.1.5. Compound disks
4.1.6. Deterioration and ходимость tyres
4.1.7. Deterioration of high-speed tyres
4.1.8. Service of tyres
4.1.9. In regular intervals worn out tyres
4.1.10. Measurement of height of drawing of a protector
4.1.11. Unilateral deterioration
4.1.12. Diagonal non-uniform deterioration
4.1.13. Noise качения tyres
4.1.14. Balancing
4.1.15. Radial and lateral palpation of wheels and tyres
4.1.16. Check of radial and lateral palpation of a disk with the tyre by means of the indicator of hour type for tyres V.A.G 1435
4.1.17. Minimisation
4.1.18. Lateral withdrawal of the car
4.1.19. Elimination of lateral withdrawal
4.1.20. Damages of tyres
4.1.21. A design of the radial tyre
4.1.22. Loss of pressure of air in tyres
4.1.23. Damages of tyres because of errors at mounting (assembly damages)
4.1.24. Marks sidewallsы tyres
4.1.25. Shift of wheels
4.1.26. Instructions on replacement and installation of wheels
4.1.27. Change of tyres
4.1.28. Removal and installation of the case of the metal gate
4.2. The general data on a car running gear
4.3. Repair of a suspension bracket of forward wheels
4.4. A back suspension bracket
4.5. Tables
5. The steering mechanism
6. Brake system
7. An onboard electric equipment
8. A body
9. Electric equipment schemes
 







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4.1.6. Deterioration and ходимость tyres

The general data
Every possible demands are made to the tyre.
Each of these requirements is put in the tyre on a certain share.
Depending on operation and car type certain requirements can be expressed more strongly, and others accordingly it is less.
From tyres with indexes of speed H, V and Z for «высокомоторизованных cars» excellent coupling even on the wet, flooded road coverings is expected. Instead of it at the given tyres the resource in kilometres can be not such big, as, for example, at tyres with an index of speed S or T.

The requirements shown to the tyre

Fig. 4.2. The diagramme of operational requirements shown to the tyre: A – behaviour at braking on a wet road covering; B – comfortableness; C – accuracy of management; D – stability at movement; E – weight of the tyre; F – prospective service life; G – resistance качению; H – hydroplaning



The circle represents a tyre resource. It shows, how shares of requirements from A to H can be distributed in a design of the tyre and in a rubber mix.
Improvement of one of characteristics involves deterioration another.

Example
Behaviour improvement at braking on wet covering A negatively influences comfortablenesses B, resistance качению G and prospective service life F.
Prospective service life of the tyre for cars depends not only on a rubber mix and a tyre design. The service conditions caused by the concrete car of feature and style of driving strongly influence on ходимость tyres.
On modern cars and with corresponding motorisation are possible both especially careful and economic, and extremely sports styles of driving. The resource of tyres from 5000 to 40 000 km and even is possible more.

THE NOTE
Style of driving it is the strongest influencing service life of tyres the factor.


4.1.5. Compound disks

4.1.7. Deterioration of high-speed tyres