Porsche Cayenne Owner's Manual page 326

After using the collapsible spare wheel
f Release air by unscrewing the valve insert.
Notes on operation
The tire will revert to its original shape only after
several hours. Only then can it be stowed in the
spare wheel recess in the luggage compartment.
There is a plastic sheet in the tool box to store the
damaged wheel.
326
Practical Tips, Minor Repairs
Maintenance note
The collapsible spare wheel must be repaired only
by the manufacturer.
f Please consult your authorized Porsche dealer
if the collapsible spare wheel is defective.