Mounting Instructions

Mounting instructions

General

Note:





^ Always use new valves when changing tyres! Steel valves (part no. 993.361.073.00) -1- are used for 18-inch Turbo II wheels and rubber valves -2- for 18-inch Turbo-Look II wheels. Steel valve assembly.
^ When fitting tyres, the direction of rotation and the inner and outer sides should be noted!
^ Use only TIP TOP Universal, order No. 593 0601 (3.5 kg bucket) or Contifix as the mounting paste!

When mounting tubeless tyres, check the sealing surface of the tyre and the disc wheel for cleanliness and any signs of damage. Bear in mind here that the bead base performs the sealing function on tubeless tyres. If the bead edge has to perform the sealing function, air can escape when the vehicle is driven aggressively.

When mounting the tyre beads, use only the prescribed tyre mounting pastes. The following can occur if an unsuitable mounting paste is used:
^ twisting of the tyre on the rim,
^ fracture of the bead core during mounting,
^ damage to the rim surface by aggressive substances.

If Contifix is used, apply sparingly to the tyre beads (due to risk of the tyre turning on the wheel). If possible, the vehicle should not be driven for 24 hours after tyre mounting or matching.

Note:
^ Customers should be informed that the full performance of new or newly mounted tyres is achieved only after a distance of 100 to 200 km (60 to 120 miles) has been driven. Extreme driving maneuvers (acceleration, braking) should be avoided.
^ The absolute limit on how far the tyre can turn on the wheel must be regarded as 20 mm. An optimum balancing result will be worsened in this case.
^ Mark the relative positions of the tyre and wheel for reference.

In order to optimize smoothness of rolling, it is expedient - and necessary in individual cases - to mount the tyre in a favorable position with respect to the wheel (matching).

Uncontrolled matching
Turning the tyre on the wheel by 90° or 180° if necessary in order to achieve an acceptable value with regard to rolling smoothness (true running, imbalance and distribution of balance weights).

Controlled matching
With a balancing machine with matching program. In most cases, this produces an even better result with regard to the rolling smoothness (true running, imbalance and distribution of the balance weights) than can be achieved with uncontrolled matching.

Fitting
Maximum permissible radial runout and lateral runout of the light alloy wheels = 0.7 mm. Maximum permissible radial runout and lateral runout of the wheel with tyre 1.25 mm. Values less than 1.0 mm - better around 0.5 mm - are desirable.
- After mounting the tubeless tyres, inflate them without valve insert to approximately 4.0 bar gauge pressure in order to ensure that they are seated properly on the wheel. 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 prescribed 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 than on the other axle can cause a noticeable change in the familiar handling. This is especially the case if new tyres are mounted on the rear axle. This effect decreases with increasing tyre mileage.

Note:
^ 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 on ZR tyres are impermissible, as is the use of inner tubes in tubeless tyres!
^ When replacing summer tyres, pay close attention to the tyre specification number!

The overview of summer and winter tyres is included in Technical Information (TI), Running Gear. The specification code N1, N2 N3 or N0 distinguishes summer tyres expressly approved by Porsche from other versions of the same tyre type and size.