A4 Quattro Cabriolet V6-3.2L (BKH) (2007)
Tires: Description and Operation
Tires With Run-Flat Capability (Pax)
Tires with run-flat capability (PAX)
Construction of tires with run-flat capability (PAX)
Run-flat tires (PAX) are specially developed tires that differ from conventional tires as follows:
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The inner and outer bead diameters differ in size. This makes it possible to add a support ring inside the tire.
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The tire is secured differently to the rim.
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This allows the tire height to be greatly reduced. This was made possible by the reduced bead area due to the special connection between the tire
and rim.
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The tire beads are formed such that they engage in the rim seat. Therefore, the tire remains firmly secured to the wheel/rim even when there has
been a loss of inflation pressure.
Construction of the bead area for a standard tire
1. Wheel flange
2. Inner plies
3. Bead core
Construction of bead zone on tires with run-flat capability (PAX)
1. Loop
2. Inner plies