General tyre mounting instructions: General

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Always use new rubber valves when changing tyres!

Important: When mounting tyres, observe the direction of rotation or inside/outside identification.

When mounting tubeless tyres, check the sealing surface of the tyre and the disk 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 (rabbit starts, hard cornering, etc.).

When mounting the tyre beads, use only the tyre mounting pastes specified below. The following can occur if an unsuitable mounting paste is used: Turning of the tyre on the wheel, fracture of the bead core when the tyre is mounted and damage to the wheel surface by aggressive substances.

Important: Use only TIP TOP Universal, order No. 593 0601 (3.5-kg bucket) or Contifix as the mounting paste.

If Contifix is used, apply sparingly to the tyre bead (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.

In order to prevent the tyre from turning on the wheel when the vehicle is driven, also inform your customers that they should avoid extreme driving maneuvers (acceleration, braking) during the first 100 to 200 km with new or recently mounted tyres. Mark the relative positions of the tyre and wheel for reference if necessary.

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.

In order to optimise smoothness of rolling, it is expedient - and necessary in individual cases - to mount the tyre in a favourable position with respect to the wheel (matching). Matching (uncontrolled and controlled) is explained below.

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.

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 3 bar gauge pressure in order to ensure that they are seated properly on the wheel.

At the latest when the pressure reaches 3.0 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. See Wheels and tyres (tyre pressure / mounting wheel on vehicle) .

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.

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.

The overview of summer and winter tyres and wheels is included in Technical Information (TI), see SUMMER TIRE AND WHEEL SUMMARY . Always observe the tyre specification code when replacing summer tyres. 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.