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Tires/Wheels - Summer Recommendations: Overview


91porsche04

November 22, 1991


Model Group

All 4

Part Identifier Number

4405 9104


Subject: Summer Tire/Wheel Rim Summary


ATTENTION: Service Manager/Service Technician

This bulletin supersedes Technical Bulletins Group 4, Number 9103, dated April 9, 1991 and Group 4, Number 9104, dated April 26, 1991.

Models Affected: All


General Information: The following contains the latest summer tire and wheel rim recommendations for Porsche vehicles. For general information on mounting, balancing and tire care, refer to Technical Bulletin Group 4, Number 8813 and the Workshop Manual.

N0, N1 or N2 Specification Numbers

The specification numbers are cast in the side wall next to the tire type casting. N0, N1 and N2 tires must not be mixed on one vehicle, even if they are the same make tires.

Only tires recommended in the latest Porsche approved tire listing should be used when replacing all tires on a vehicle.

When replacing only one tire, the tread depth difference should not exceed 30% on one axle.


Important:

The 17 inch wheels are double hump rims. The wheel's inner hump is the "normal" design used on other Porsche wheels, but the outer hump is asymmetrical. The asymmetrical hump prevents a flat tire from moving off the wheel rim. This provides improved control for safely stopping the car. So long as the tire sidewall is not damaged, the car can be driven, with extreme caution, a short distance to a safe place to change the tire.

When breaking the tire bead on these wheels, start at the tire valve. When mounting the tire, start the outside bead on the wheel in the area opposite the valve stem.

Note: When installing 17 inch wheels, the color coded wheel stud (and wheel lock) should be indexed opposite the tire valve.


Tire pressures are only applicable for Porsche approved tire makes and types. Measure tire pressure only when the tire is cold (approx. 20~C or 68~F). Do not under inflate tires. Air pressure increases as the tires get hotter. This increased pressure must not be reduced.

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