SEAT Workshop Service and Repair Manuals

Damage from impacts Bulging on the tyre sidewalls is generally a sign of a break in the steel cables on the interior of the tyre.

The usual cause of this type of damage is a knock at a sharp angle against a curb, for example. Tyre carcasses flattened in this way may be damaged. In these cases, the interior part of the tyre is strained until some of the carcass threads break. The severity of the damage depends upon the speed of collision, the angle of collision, the tyre pressure, the axle load and the type of obstacle.

Signs of the collision on the tyre sidewall -arrows-   Note t  Care should be taken not to drive onto kerbs! t  When driving on a curb always approach very slowly at an obtuse angle.

Interior view of a tyre with a broken carcass As a result of the hard impact the carcass has been flattened against the contour rim, and has broken at the contact area.

Damage to the interior of the tyres caused by collision (double fracture) Double fault -arrows- resulting from pinching together when driving over a curb. This is frequently not visible from the exterior. Outer view of tyre with broken carcass

A broken carcass can be recognised from the outsides by the signs shown in these illustrations.

This second effect is known as an „air pouch “