Wheel/Tire - General Information: Overview
88porsche11Technical Bulletin
Subject: Wheel/Tire General
Information
Model
All
Part Identifier
4405
Group
4
Number
8813
The following contains general information for summer and winter rims and tires. Where information applies to winter tires only, it is so noted. Otherwise, all information applies to both summer and winter tires.
Tire Chains
When driving a car with summer tires on winter condition roads, always have tire chains in the car since no particular make of summer tire can be classified as suitable for winter driving. Correctly fitting tire chains are available for all common tire sizes. Refer to Parts Bulletin, Group 10, Number D16. Vehicles with rear axle spacers may not be suited for use with chains.
Winter Tires General Information
Winter tires are available for use in different application ranges.
Range A: For all driving conditions.
Range B: For frequent highway driving.
Range C: Only for heavy snow regions.
Range D: Only where studded tires are permitted.
The technically permitted top speed of winter tires is indicated by the "speed index" after the size information. Q = max. 100 mph (160 km/h) T = max. 119 mph (190 km/h) H = max. 131 mph (210 km/h)
Naturally the car must be driven at a speed conforming with road conditions and/or speed limits.
Winter tires may be used in the same size as summer tires. Standard size tires may not give you the same grip in deep snow as narrower tires, however, they are equivalent on ice or packed snow. They also have better handling properties on wet and dry roads.
Narrow size tires should be selected if driving is frequently done in deep snow, as in snow belt areas.
Winter tires will not offer the same behavior on dry roads in regards to handling, rolling comfort and wear, as summer tires.
December 30, 1988