911 Carrera Coupe F6-3164cc 3.2L (1984)
The 7" and 8" Porsche rims must be fitted with valve supports, Part No. 911.361.561.00 or 01, to avoid lateral stress on rubber valves caused by the
design position of the valve bore.
The 7J x 15 pressure cast rims (from ATS) will sometimes have a special cast boss in the area of the valve bore which provides safe valve support.
On rims which have this cast boss, the wall thickness at the valve hole will be so large that when installing tubeless tire valves the 3 mm wide bead ring
must not be pulled through - as is common for steel rims. Pulling the valve bead through would cause excessive expansion of the valve.
Tubeless tires must be mounted without tubes only on rims with double humps. An appropriate tube would have to be used with these tires when
mounting on earlier rims.
When necessary, a tubeless tire may be matched with a tube tire on the same axle if make, size and type are identical. Rims with double humps were
introduced on the 1976 models.
Original Porsche rims can be identified by the Porsche part number on the rim:
901.361.xxx.xx - rim without humps 911.361.xxx.xx - rim with double hump
x= digits for internal designation of version and paint
Pressure cast rims are not always sufficiently airtight because of the rougher structure. Consequently, they are suitable for use with tubeless tires only
after appropriate testing. Beginning with some 1976 models, Porsche pressure cast rims are tested for gas leaks and are approved for use with tubeless
tires.
Note
Always use self-centering rims on vehicles with selfcentering hubs.
Use only steel wheel nuts on steel rims.
