Wheels and Tires: Description and Operation

Tire condition / tire pressure
Tires are a safety element which fulfill the demands placed on them only if they have the correct air pressure and a sufficient tread depth.

The stated air pressures are minimum pressures and must never be fallen below, since in addition to the unfavorable driving performance, this would bring about a risk of serious tire damage.

Valve caps protect the valve from dust and dirt and therefore from leaks. Always screw caps tight and replace any missing caps.

For reasons of safety, besides a check on air pressure a visual check should be made for sufficient tread depth, foreign bodies, punctures, cuts, cracks and bulges in the sidewall (ply breakage).





Cold Tire Pressure (At Approximately 20 Degrees C)

Overview of tires and wheels
The chart of tires and wheels for summer and winter should be taken from Technical Information (TI).
When replacing summer tires, pay close attention to the tire specification number. The specification characters N1, N2, N3 or NO distinguish the summer tires specially authorized by Porsche from other models of the same tire type and size.

Notes on mounting tires
When fitting tires, the direction of rotation and the inner and outer sides should be noted.

Mounting wheel on vehicle
The wheel bolt consists of two parts that are permanently joined together. Other wheel bolts must not be used.

Use suitable commercially available tools (wrench size 19 mm). Never use an impact bolter to tighten the wheel bolts.

Always apply a thin coat of Optimoly TA (aluminum paste) on the thread of the wheel bolts, on the shank and between the bolt head bearing surface and spherical cap ring (under the head).

Do not grease the spherical cap bearing surface of the wheel bolts that faces the wheel!

In the case of heavy soiling, first clean the wheel bolts and the concavities in the wheel with a lint-free cloth.

Damaged wheel bolts must always be replaced. This damage includes mechanical damage to the thread, the spherical cap and damage resulting from seizure of the bolt head bearing Surface and spherical cap ring.

Rework on wheel bolts is impermissible.

Screw in wheel bolts by hand and then tighten evenly, Start at the top when tightening. Always observe the specified tightening torque of 130 Nm (96 ft. lbs.).