WM, 4440IN Information On Tires/Mounting Tires: Information: Tires
Tire damage - caused while driving
If a tire is damaged and it cannot be determined with absolute certainty that there is no ply damage - with all of its consequences - or if the tire was thermally or mechanically overloaded due to a loss of pressure or other prior damage, we recommend replacement of the tire in question for safety reasons.
Tire damage - caused while removing/mounting tires
When mounting tubeless tires, check the sealing face of the tire 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 tires. When mounting the tire beads, use only the specified tire mounting pastes. The following can occur if an unsuitable mounting paste is used:
- Twisting of the tire on the rim.
- Fracture of the bead bundle during mounting and if the seating pressure is too high.
- Damage to the tire bead.
- Damage to the rim surface by aggressive substances.
Replacing tires
Tires should not be more than 6 years old!
Repairs to the tires are not permitted nor is the use of inner tubes in tubeless tires.
When replacing a tire on an axle, make sure that the tread depth of the new tire does not differ from that of the other tire by more than 30%.
If new tires are mounted or the tires of one axle are replaced, tires of the same make and with the same specification code must always be used on each of the two axles.
If tires are replaced on one axle only, the different tread depth in relation to the other axle can cause a noticeable change in the handling the driver has become accustomed to. This is especially true if new tires are mounted on the rear axle. This effect decreases with increasing tire mileage.
The overview of summer and winter tires is included in Technical Information (Tl), Group 4. When replacing summer tires, pay close attention to the tire specification number for the same make of tire. The specification code (for example NO) distinguishes the summer tires specially authorized by Porsche from other models of the same tire type and size.
Customers should be informed that the full performance of new or newly mounted tires is achieved only after driving the vehicle for a distance of 100 to 200 km (60 to 120 miles). Extreme driving maneuvers (acceleration, braking) should be avoided.
Tire storage
Tires must be stored in a cool, dry and darkroom with adequate ventilation. They must never come into contact with fuel, oil, grease or chemicals. Complete wheels can be stacked for storage. It is advisable to increase the tire pressure by 0.4 bar (6 psi).
If the tires are not mounted on wheels, store them in the vertical position. Tires stored in vertical position should be turned every two weeks in order to prevent excessive flat spots. If the tires are stacked in horizontal position, they will become severely deformed and cannot be seated in the rim flange easily when mounted.
Tires age due to physical and chemical processes, which can impair their function. If they are stored for an extended period, they will harden and become brittle faster than tires that are in continual use. Hairline ageing cracks can occur on older tires. If tires are in use, the kneading action activates the plasticizer in the rubber and thereby prevents hardening and cracking.
Tire identification (speed classes/tire age)
Tires should not be more than 6 years old!
The age of the tire can be determined from the manufacturer's code, which is shown behind the DOT code on the tire sidewall!
The date of manufacture (the last four digits) is shown at the end of the code!
Example
| DOT DM CP 05 Y 2200 | 22 = production week |
|---|---|
| 00 = production year 2000 |