Tires/Wheels - Winter Tires, Snow Chain Application
911 Turbo5/00 4440
Binder - 4, Running Gear
11-3-00
Winter Tires, Wheels and snow Chain Applications
Vehicle Type:
911 Turbo (996)
Model Year:
2001 (1)
Concern:
Approved Winter Tire Summary.
Information:
Summer and winter tires have opposite, seasonal, and specific applications. This is particularly true for high performance Porsche vehicles equipped with wide "ZR" tires designed for safety on dry and wet roads.
The cold weather performance of summer tires is not adequate for winter conditions and their use is discouraged under those conditions.
Summer tires at temperature below 5° Celsius (41°F) exhibit a decrease in their ability to adhere to the road surface. Installation of the approved winter tire/wheel combinations during cold weather conditions is strongly recommended.
Approved Winter Tires and Types
Tires of the same make and type can only be used on a vehicle.
Observe tire markings on side wall for correct mounting:
Arrow with inscription "Rotation" = uni-directional mounting
Inscription "Inside" or "Outside" = side-directional mounting Inflation Pressures:
Inflation Pressures:
The tire pressure shown are valid only for tires approved by Porsche. Tire pressures must be checked and adjust cold (approximately 20° degrees Celsius or 68° degrees Fahrenheit). Tire pressures can never be lower than what is specified above.
Do not drive on under-inflated tires under any circumstances!
Tire Sizes:
Approved Winter Tires, Wheel Sizes:
Wheels:
Wheel Fastening:
Secure the wheels to the hubs with five (5) Porsche lug bolts, M14 x 1.5 x 45 mm (19 mm socket size), tightening torque 130 Nm (96 ft lb.). Use only original Porsche wheel bolts with rotating spherical cap ring.
Snow chains are offered by Porsche as accessories as shown.
Observe the tire chain installation instructions. For safety reasons, snow chain equipped vehicles may not be operated at speeds above 30 mph (50 kmh). Always observe local laws and ordinances.
Notes:
The rubber valve stem are not for 18" Turbo wheels.
For 18" Turbo II wheels use part number, 993 361 073 00, steel valve.
Use approved assembly paste to facilitate mounting and to prevent damage to tire beads. Avoid extreme acceleration and braking for the first 60 to 120 miles to prevent tire movement on the wheel. Wheel balancing accuracy may be affected should this occur.
Maximum allowable tire movement on the wheel rim is 20 mm.
Optimal wheel balancing and minimal tire noise can be achieved by matching the tire runout to the wheel. Please refer to the following comments on controlled and uncontrolled matching.
Uncontrolled matching:
If required, move tire on wheel by 90 or 120 degrees to find acceptable values regarding out of round conditions, imbalance, and wheel balancing weight application.
Controlled matching:
Use balancing equipment with matching program capability. Values can be optimized.
Maximum permissible axial and lateral run out of wheels <=0.7 mm. Maximum permissible axial and lateral run out of tire and wheel assembly <= 1.25 mm (desired value <=1.0 mm).
When mounting tires do not exceed inflation pressure of 4.0 bar (58 psi) while seating tire beads.
When new tires are mounted on one axle always use a matched set from the same tire manufacturer with the same "N" designation. The handling characteristics of the vehicle may be affected by differing tread depths between front and rear axle tire sets. This effect is especially true when the rear tire set has been replaced. Use caution during break in of tires.
When handling tire complaints and tire damage is determined, the tire should be replaced. The tire should also be replaced if you are uncertain about cord damage or if the appearance of overheating makes the tire suspect in any manner.
When replacing a single tire on one axle, the difference in tread depth on the axle may not exceed 30%. Repairs to ZR tires, or the use of tire tubes are not permitted.
The chemical and physical properties of a tire may be affected by long storage time, and the rubber compound may harden over time. Tires which are in constant use or motion will maintain a pliable compound and delay the hardening process. Therefore, the concern should not only be tread depth but the age of the tire as well. Tires should not be older than six years from date of manufacture. The tire age can be determined from the DOT stamp on the outside of the tire sidewall. For example, "DOT...067" = week 6, 1997.
Generally, tires should be stored in a cool, dry, and well ventilated area. keep away from sunlight. Avoid contact with fuels, grease, oils, and other chemicals.
Mounted wheel sets may be stacked if required. It is recommended to increase tire pressure by approx. 0.4 bar (6 psi) during storage.
Tires that are not mounted should be stored in a vertical position. Turn tires every two (2) weeks to avoid flat spotting. If tires are stored in a horizontal manner, they may deform and become difficult to install.
For proper storage of the complete wheel, Porsche has available through it's Parts Department a storage cart, part number, 000 044 000 38. The age of the type can be determined via the DOT code on the sidewall,
Navigation System:
After a tire and wheel change, the full locating accuracy is attained only after a trip of approximately 30 miles.
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