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Bead damage caused by fitting machine > < Loss of air from tyre
Damage occurring when fitting tyres
Damage occurring when fitting tyres
Bead core broken during tyre inflation.
   
Modern radial ply tyres for passenger cars are mounted only on safety rims. Safety rims have a hump -1- running along the bead seat.
1 - Hump (H2)
2 - Inner bead seat
3 - Rim
4 - Wheel
5 - Outer bead seat
The hump prevents the tyre from being pressed out of the bead seat when travelling with insufficient tyre pressure.
When the tyre is inflated, the bead of the tyre may not slip completely over the outer rim hump.
In this case, there is a danger of the bead core becoming overstretched if the tyre pressure is too high. The steel wires would then rupture partially or completely. A broken bead core cannot be detected from the outside.
  DANGER!
t  Tyres with damaged bead cores are not seated safely and securely on the rim. Such tyres are a safety risk!
t  In addition, there is a risk of the partly broken bead core breaking apart during continued operation and the tyre could suddenly tear open. If the bead core breaks during inflation, the carcass will also be destroyed.
  A44-10040

Bead damage caused by fitting machine > < Loss of air from tyre