Information At low temperatures, juddering noises caused by the tires can occur during maneuvering or accelerating out of curves on both dry and wet road surfaces.
The driving performance and comfort of summer tires are impaired at low temperatures below 45 °F (7 °C). Porsche therefore recommends that you fit snow tires on the vehicle at temperatures below 45 °F (7 °C).
Extremely low temperatures below 5 °F (-15 °C) can cause permanent damage to summer tires. Snow tires are no longer suitable when their tread depth falls below 0.16 in. (4 mm).
Using snow chains
Install snow chains only on the rear wheels and only with the tire/rim combinations designated for use with snow chains listed in the Technical Data.
Follow instructions issued by the supplier of the chains.
Use only the fine-link snow chains authorized by Porsche so that sufficient clearance between the wheel well and the chain is assured.
For information on approved snow chains: Please see chapter “Wheels and tires” on page 393.
Vehicles with snow chains must not be driven faster than 30 mph (50 km/h).
Remove ice and snow deposits in the wheel well before installing the chains.
Remove chains as soon as the roads are free of ice and snow.
Observe the different national regulations regarding maximum speeds.
Remove spacers when snow chains are fitted.
Information In the case of 18-inch tires, snow chains can also be fitted on the front axle if the chains approved by Porsche are fitted on all four tires.
Checking tire tread
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specific government test course. For example, a tire graded 150 would wear one and a half (1-1/2) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.
Check tire tread regularly, particularly before and after long journeys.
The original equipment tires on your Porsche have built-in tire wear indicators. They are molded into the bottom of the tread grooves and will appear as approximately 1/2 in. (12 mm) bands when the tire tread depth is down to 1/16 of an in (1.6 mm).
When the indicators appear in two or more adjacent grooves, it is time to replace the tires. We recommend, however, that you do not let the tires wear down to this extent.
Worn tires cannot grip the road surface properly and are even less effective on wet roads.
For safety reasons, replace the tires before the wear indicators appear. Snow tires are no longer suitable when their tread depth falls below 5/32 in. (4 mm).
In the United States, state laws may govern the minimum tread depth permissible. Follow all such laws.
Measuring tire tread depth
Insert a commercially available tread depth gauge or caliper in the tire tread and measure the tire tread depth.
Information Unevenly worn tires indicate a fault in the vehicle:
Visit an authorized Porsche dealer, as they have trained technicians and the necessary parts and tools.
Always store wheels in cool, dry and dark conditions. Store tires without rims vertically.
Do not store summer tires or park vehicles with summer tires mounted at ambient temperatures below 5 °F (-15 °C).
Avoid contact with gasoline, oil or grease.
Do not use tires that are older than 6 years. Chemical additives, which make the tire rubber elastic, lose their effectiveness over the course of time and the rubber becomes brittle. The age of the tire can be seen from the DOT code number shown on the tire sidewall. If, for example, the last four digits read 3016, then the tire was produced in the 30th week of 2016.