Tyres with run-flat capability (PAX)

Make

Audi

Model

A5

Section

Wheels and tyres › Wheels, tyres. axle align › Tyres with run-flat capability (PAX)

Running gearTyres with run-flat capability (PAX)

Construction of tyres with run-flat capability (PAX) Run-flat tyres (PAX) are specially developed tyres that differ from conventional tyres as follows: PAX tyre with support ring –  -I- PAX tyre with air

–  -II- PAX tyre without air –  The tyre is anchored on a special rim which prevents the tyre from sliding off when air is lost. The support ring is made of rubber and maintains stability in the event of a pressure drop. t  The inner and outer bead diameters differ in size. This makes it possible to add a support ring inside the tyre. t  The tyre is secured differently to the rim. t  This allows the tyre height to be greatly reduced. This was made possible by the reduced bead area due the special connection between the tyre and rim. t  The tyre beads are formed such that they engage in the rim seat. Therefore, the tyre 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 tyre 1 -  Wheel flange 2 -  Inner plies 3 -  Bead core

Construction of bead zone on tyres with run-flat capability (PAX) 1 -  Loop 2 -  Inner plies 3 -  Bead core 4 -  Wheel flange

Seating of tyres with run-flat capability (PAX) Due to the construction of the tyre, it remains firmly attached to the wheel in all driving situations. A wedged-shaped component of the tyre is thereby pressed between the bead core and rim by the load. This occurs regardless of the tyre pressure.

Dimensions of tyres with run-flat capability (PAX) As compared to standard tyres, run-flat tyres (PAX) have different dimensions and designations. Run-flat tyres (PAX) can therefore only be fitted to special wheels designed for the PAX system. 1 -  Width in millimetres: tyre width from sidewall to sidewall on the standard rim (corresponds to the width dimension on standard tyres) 2 -  Outer diameter in millimetres: maximum diameter of the new tyre 3 -  Nominal diameter in millimetres on standardised rim seat 4 -  Small bead diameter in millimetres: outer rim seat 5 -  Larger bead diameter in millimetres: inner rim seat

01 Steering & suspension