Porsche 928 S 1984 Owner's Manual page 77

Removing and storing tires
The driving direction should be clearly marked
on all tires before removing them for storage.
This is to make sure that they are mounted
and run in the same direction as before. When
remounting, put tires with the most tread depth
at the front. Have tires/wheels balanced as
soon as possible.
Store tires in a cool and dry place.
Snow tires
For a better grip on snow and ice use radial
M+S tires or snow tires with studs. Check
with your local Motor Vehicle Bureau for pos-
sible restrictions.
Radial ply M+S tires should be inflated with
the same cold tire inflation pressures required
for the regular radial ply tires. However, do
not exceed the maximum tire inflation pres-
sure listed on the tire sidewall.
Snow tires should have the same load capac-
ity as original equipment tires and should be
mounted on all four wheels. Snow tires with
studs should be run at moderate speeds when
new in order to give the studs time to settle.
WARNING
Tires with badly worn treads and studs are
very dangerous. Make sure they are re-
placed immediately.
74
Do not drive a vehicle equipped with snow
tires at prolonged high speed. Snow tires do
not have the same degree of traction on dry,
wet or snowfree roads as a normal tire. Further-
more, snow tires wear rapidly under these
conditions.
Snow tires do not fulfill their purpose if the
tread depth is less than 5/32 in/4 mm.
Snow chains
Should snow chains be necessary, they
must be mounted on the drive wheels only.
Check with local authorities for possible re-
strictions.
Use only snow chains with fine pitch links,
so that enough space remains between the
chains and the inside of the wheel arches.
Drive wheels must rotate freely with chains
mounted to prevent damage to body, axle or
brake components. Follow instructions issued
by the supplier of the chains. Remove chains
as soon as roads are free of ice and snow.
New tire identifications
The European tire manufacturers have changed
their tire identification system for SR and
HR-tires pertaining to maximum permissible
speed and maximum load carrying capacity
for belted tires. The following is an example
only.
During the transition period some tires might
show both old and new identification codes,
such as: 185/70 SR 15 M+S 88 Q. In this in-
stance, the new codes apply.
The identification codes for VR tires remain
unchanged; for example: 225/50 VR 16. (V=
maximum permissible speed for radial tires,
i.e. over 130 mph or 210 km/h).