Wheels/Tires - Approved Tires/Wheels/Spacers
04/07 ENU 4440Approved Tires, Wheels and Spacers
Nov 5, 2007
Note
This Technical Information replaces Technical Information No. 4/07 dated April 10, 2007.
Vehicle Types:
Cayenne/Cayenne S/Cayenne Turbo/Cayenne Turbo S
Model Year:
As of 2003 up to 2006
Situation
Approval of new tire makes and types. October 2007.
Warning of Mixed Tire
Winter Tires:
All-Terrain Tires:
The approved all-terrain tires are designed for all road conditions.
In addition to its driving safety on dry and wet roads, the all-terrain tire also features an M+S identification and is therefore also suitable for conditional winter driving. For winter road conditions (low outside temperatures, Icy roads, etc.), the all-terrain tire cannot compare to a winter tire. In off-road driving situations, the all-terrain tires demonstrate a high level of traction on the most varied surfaces such as dry terrain, gravel, rock, mud, wet grass and sand. Especially on unpaved (amorphous) surfaces, this superior traction is achieved though a good tread self-cleaning effect, which can be Influenced by the tread design and an appropriate choice of rubber composition.
All Season Tires
Summer Tire:
Tire Pressure:
ATTENTION
Damage to wheel surface.
Wheels:
Snow Chains:
Wheel Mounting:
Tightening torque 160 Nm (118 ftlb.)
Removing/mounting
Before mounting or removing a wheel, screw the assembly aids (threaded bolts for wheel mounting, Part No. 999.571.074.30) into the wheel hub instead of the two wheel bolts. Only then should you remove the three remaining wheel bolts and remove the wheel carefully, without touching the brake discs. The wheels are secured with standard wheel bolts (M14 x 1.5 x 51), Part No. 955.361.203.01. Never grease the wheel bolts. Only "original Cayenne wheel bolts" may be used! Screw in wheel bolts by hand and then tighten evenly in diagonally opposite sequence. Start at the top when tightening.
Navigation Systems
After a wheel or tire change, the full locating accuracy is attained only after a trip of approx. 30 miles (50 km), if possible on a highway and at a speed > 40 mph (60 km/h). Additionally, a high wheel slip factor (e.g. wheel spin on snow) can result in temporary incorrect positioning.
TPM Tire Pressure Monitoring System
New wheels must be equipped with wheel transmitters for Tire Pressure Monitoring. Check battery charge status of wheel transmitters before changing tires. Switch off ignition when changing a wheel.
If the properties of the new tires do not correspond to the settings in the on-board computer, a message is displayed.
After changing a wheel, the tire settings in the on-board computer need to be updated (see operating instructions).
General:
Always use new valves when changing tires.
Always observe any possible instructions concerning the rolling direction and/or specifying which side the tires must be mounted on. Refer to notes at the beginning of this bulletin (if applicable).
Coat the tire beads and humps with mounting lubricant before mounting the tire. This ensures that the tire beads will slide over the humps easily. In order to prevent the tire from turning on the wheel, avoid extreme driving maneuvers (acceleration and braking) during the first (100 to 200 miles) with new or recently mounted tires.
In order to optimize smoothness of rolling, it is appropriate - and necessary in individual cases - to mount the tire in a certain (favorable) position with respect to the wheel (matching).
Matching (uncontrolled and controlled) is explained below;
Uncontrolled matching:
Turning the tire on the wheel by 90° or 120° if necessary in order to achieve an acceptable value with regard to rolling smoothness (true running, imbalance and weight 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 weight distribution of the balance weights) than can be achieved with uncontrolled matching. Maximum permissible radial runout and lateral runout of the wheels < 0.7 mm. Maximum permissible radial runout and lateral runout of the wheels with tires < 1.25 mm. Values 1.50 mm - ideally approx. 0.5 mm - are desirable.
The mounting pressure (seating pressure) of 58 psi/4.0 bar overpressure must not be exceeded before both tire beads are evenly seated on the rim flange.
If new tires are to be mounted or the tires of one axle are to be replaced, tires of the same make, the same type 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 from that on the other axle can cause a noticeable change in the familiar handling. This is especially the case if new tires are mounted on the rear axle. This effect decreases with increasing tire mileage.
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 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.
Repairs on "ZR" tires are not permissible, as is the use of inner tubes in tubeless tires. Tires age due to chemical and physical processes, which can impair their function. Tires that are stored unused for an extended period harden and become brittle faster than tires that are in continual use. Hairline aging cracks can occur on older tires. On tires in continual use, the kneading action activates the plasticizer in the rubber and thereby prevents hardening and cracking.
Therefore, attention should be paid not only to the tread depth but also to the age of the tire. Tires should not be older than 6 years. The age of the tire can be determined via the DOT code on the sidewall, which indicates the production date of the tire e.g. DOT 2201 = 22nd week of 2001.
Tires/complete wheels must be stored in a cool, dry and dark room 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. Optimum conditions for proper storage of the complete wheels are provided by the Original Porsche storage stand (trolley), Part Number 000 044 000 38.
It the tires are not mounted on wheels, it is best to store them in a vertical position. In this case the tires should be turned every two weeks in order to prevent excessive flattening. If the tires are stacked in horizontal position, they will become severely deformed and cannot be seated in the rim flange easily when they are fitted.
References:
--> Workshop Manual '44 Wheels and tyres'
--> Workshop Manual '440519 Removing and installing wheel'
--> Workshop Manual '44 General information on Tyre Pressure Monitoring (TPM)'
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