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Excessive Speed for Tires
Exceeding the maximum permitted speed for the tires fitted could cause tire failure.
We recommend fitting snow tires on the vehicle at temperatures below 45 °F (7 °C) since the driving performance of summer tires is reduced at low temperatures. Summer tires may be permanently damaged at extremely low temperatures.
Snow tires lose their traction capability when their tread depth falls below 5/32 in. (4 mm).
Risk of damage to body, axle or brake components.
Different states and countries have varying statutory requirements regarding maximum speed.
Check with local authorities for possible restrictions.
Fitting snow chains
The use of snow chains is not permitted when 5 mm spacers are mounted.
Risk of damage to the wheel housings if the 5 mm spacers are not removed before fitting snow chains.
Due to new speed and load ratings for radial tires, new designations have come into force for snow tires for your Porsche.
The designation to be used for ZR tires is e.g., 265/40 ZR 18 (Z = code letter for radial tires for speeds above 150 mph / 240 km/h).