Tyre damage due to errors during tyre fitting (fitting damage) (VW Touareg 1)

The bead core ruptured while inflating the tire

Modern radial tires for passenger cars are mounted exclusively on safe disks. Their rims have a raised area 1 on the shoulders along the entire circumference (Fig. 4.26).



The hump protects the tire from slipping off the rim shoulder when driving with low air pressure.

When inflating a tire, it may happen that the tire bead does not move completely over the outer hump of the rim.

In this case, there is a risk of overstretching the bead core under too high pressure, causing its steel threads to rupture partially or completely. The rupture of the bead core is not visible from the outside.

CAUTION: Tires with a damaged bead core do not sit tightly on the rim. Such tires are extremely unsafe to operate. In addition, there is a risk that the torn bead core will completely rupture while driving, and the tire will suddenly explode. If the bead core ruptures while inflating the tire, the carcass is also destroyed.

A tire with a torn bead core and a destroyed carcass

Figure 4.27 shows a tire with a torn core and destroyed carcass as a result of excessive stretching during installation.





The original information is posted on the website: www.VWmanual.ru

Damage to the sidewall due to incorrect or improper tire mounting at a tire mounting stand The following tire mounting errors can lead to serious tire damage:

• if, when rolling the upper bead on a tire mounting stand, the opposite bead of the tire does not lie completely in the cavity;
• if the mounting head was adjusted incorrectly;
• if the edge of the mounting roller rolls on the side roller;
• if the guide rollers are worn or sharp.

Tires with cut sidewalls

In such cases, the bead under high voltage may be notched, cut and/or pinched down to the core wire (Fig. 4.28).



Often, traces of the beginning and end of contact with the guide roller are visible in the damaged area.

NOTE: In principle, both tire beads and rim shoulders must be lubricated with tire mounting paste.

NOTE: If damage during mounting remains unnoticed, there is a risk of tyre failure during further use. Never mount tyres without tyre mounting paste.

NOTE: Do not inflate with explosive inflation above 3 bar. Do not inflate tires above 4 bar. At the end of tire mounting, deflate the tire to the prescribed value.