WM, 4440IN Tyres: Information: Installation

WARNING: This page is about a different variant/trim than selected.

WARNING: High tyre seating pressure

Risk of squashing or bruising
→ Use a tyre filling cage.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Tyre filling cage (shown as an example)

After mounting the tubeless tyres, inflate them without valve insert to a maximum of 4.0 bar gauge pressure to ensure they are seated properly on the rim. At the latest when the pressure reaches 4.0 bar, the tyre beads must pop out of the deep bed and over the hump of the wheel shoulder in order to avoid fractures of the bead core. If necessary, interrupt the process and coat all necessary surfaces with lubricant (tyre mounting paste) again. Then repeat the process. Screw in the valve insert and set the specified tyre pressure.

If new tyres are to be mounted or the tyres of one axle are to be replaced, tyres of the same make and with the same specification code must always be used on each of the two axles. If tyres are replaced on one axle only, the different tread depth in relation to the other axle can cause a noticeable change in the handling the driver has become accustomed to. This is especially true if new tyres are mounted on the rear axle. This effect decreases with increasing tyre mileage.

The overview of summer and winter tyres is included in Technical Information (TI), Group 4. When replacing summer tyres, pay close attention to the tyre specification number for the same make of tyre. The specification characters (for example N0) distinguish the summer tyres specially authorised by Porsche from other models of the same tyre type and size.

Information

If a tyre is damaged and it cannot be determined with absolute certainty that there is no ply damage - with all of its consequences - or if the tyre was thermally or mechanically overloaded due to a loss of pressure or other prior damage, we recommend replacement of the tyre in question for safety reasons.
When replacing a tyre on an axle, make sure that the tread depth of the new tyre does not differ from that of the other tyre by more than 30 %.
Repairs to the tyres are not permitted nor is the use of inner tubes in tubeless tyres.
When replacing summer tyres, pay close attention to the tyre specification number.