Tires/Wheels - Approved Summer Tires And Wheels
Cayenne17/04 4440
Binder - 4, Running Gear
This bulletin replaces bulletin Group 4, # 14/03, dated 1-2304.
Summer Tires and Wheels
Vehicle Type:
Cayenne/Cayenne S/Cayenne Turbo
Model Year:
As of 2003 (3)
Date: 11-19-04
Concerns:
Summer Tires and Wheels - status September 2004
Makes/Types:
Approved Tire Makes and Types
Information:
"N..." = Specification code of the tire, e.g. "NO" "N1" "N2"
The complete code "N..." of the tires in question must be located on the tire sidewall near the tire type designation. Only tires of the identical type and make and with the identical speed symbol and specification code can be used on the same vehicle.
Instructions for correct mounting of the tires are also given on the tire sidewall:
Arrow with "Rotation" marking = directional mounting
"Inside"/"Outside" marking = mounting on specified side only
Arrow with "Rotation" marking and = directional mounting on specified side only
"Inside"/"Outside" marking
If there are no mounting instructions on the tire sidewall, the tire must be mounted so that the DOT code is visible from the outside.
Tire Speed Ranges: (speed symbol)
Tire Pressure:
The specified tire pressures apply only to the tire types and makes approved by Porsche (including all of the winter, all4errain, all-season and summer tire types) and are specified for cold tires approx. 68° F. (20° C.). These are minimum tire pressures and must always be observed, since in addition to the unfavorable driving performance, serious tire damage could be caused.
On vehicles equipped with a tire pressure monitoring system, use the rocker switch to select the type of load on the on-board computer "Main menu > Tire pressure > Settings > Load".
Danger!
Increased risk of accident due to insufficient tire pressure and/or due to defective tires.
> The tire pressure must never fall below the tire pressure indicated below.
> Check the tires at regular intervals for uniform profile wear and for possible damage such as cracks, bulges, separation in the contact surface, penetration by foreign objects, etc.
> Tires older than 6 years are to be replaced.
Always replace tire valves at every tire change.
Sizes:
Caution!
Damage to tires and/or the wheel surface. Risk of surface damage if the tires, valves are not mounted according to regulations, and/or if the wheel surface is not cleaned/cared for correctly.
> Carry out tire removal and mounting with a bead holding-down device only.
> Use a leather pad on the rim flange to support the valve insertion tool.
> Use only the Porsche centering clamping set for balancing.
> Do not clean the wheels with brushes (car wash and washing car by hand). Deep scratches in the surface coating of the wheel cannot be repaired by polishing.
In no case may tires be treated with solvents or other chemical agents (e.g., for cleaning/coloring).
Wheels:
Wheel Mounting:
Removing/Mounting:
Screw the assembly aids (threaded pins for wheel mounting, Part Number,. 999 571 074 30), instead of 2 wheel bolts, into the wheel hub before mounting or removing a wheel. During removal, first remove the 3 remaining wheel bolts and remove the wheel carefully, without touching the brake discs.
The wheels are secured with standard wheel bolts M 14 x 1.5 x 51, Part Number, 955 361 203 01. Tightening torque: 160 Nm (118 ftlb.).
Important Note:
Never grease the wheel bolts. Only "original Cayenne wheel bolts" should be used! Screw in wheel bolts by hand and then tighten evenly in diagonally opposite sequence. Start at the top when tightening.
Tire Mounting:
The procedure for changing the wheels or tires on vehicles (with or without tire pressure monitoring system) is described in Group 4 of the Cayenne Technical Manual.
General:
The driver must adapt his or her driving behaviour (speed) to the respective road conditions. This applies in particular to winter road conditions. Summer, All Terrain and All Season tires have wear indicators (webs) in the tread base in most cases. These indicators can close oft the drainage grooves when the residual tread depth is approx. 4 mm. Below this tread depth, the characteristics on wet roads, snow or slush become increasingly worse.
The procedure for changing the wheels or tires on vehicles (with or without tire pressure monitoring system) is described in Group 4 of the Cayenne Technical Manual. Always use new valves when changing tires:
Rubber valve, Part Number, 955 361 071 00
Valve Cap, Part Number, 955 361 163 00
Always observe any possible instructions concerning the rolling direction and/or specifying which side the tires must be mounted on.
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.
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 6 psi (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.
If the tires are not mounted on wheels, it is best to store them in vertical position. Tires stored in vertical position 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 mounted.
References:
Cayenne Technical Manual, Group 4:
> Repairs: 44 - Wheels and tires.
POSES. Technical Information Bulletin, Group 4
# 7/04 - 17 mm Spacers
# 9/04-Wheels For 19 Brakes
Owner's Manual
> Observe the chapters "Multi-purpose display", "Wheels" and "Car care".
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