Winter Tires: Notes

M+S-Symbol

On a "M and S tire" (mud and snow), the tread pattern, tread compound or type are designed such that the handling characteristics in snow are improved compared to a normal tire. This is especially true when initiating or maintaining vehicle motion.

The winter handling properties of tires marked with "M+S" are not defined or checked using measurements.

Snowflake symbol

The "snowflake" symbol (3 Peak Mountain Snow Flake Symbol) indicates winter tires that meet the industry standard on which the American definition of winter tires is based.

These tires provide exceptionally good safety and control performance on snow, ice, and in cold weather and exceed the winter performance of tires marked only with "M+S".

M+S designation for 4x4/SUV tires

Some vehicles come equipped with tires bearing the "M+S" symbol on the outer side. This is due to the fact that these vehicles were first introduced in North America, where "M+S" all-season tires are common. The "M+S" designation is officially defined by an EU-Regulation thusly: "A tire, whose profile and structure is designed to be more efficient in snow than a normal tire". Performance data for "M+S" denoted tires are neither defined, nor measured. The "Snowflake Symbol" (snowflake on the mountain symbol) is used in North America to specify the snow performance of winter tires. Only tires that meet or exceed these requirements may bear the "Snowflake Symbol" (snowflake on the mountain symbol).

Using winter tires

From 05/01/2006, the road traffic regulations were changed to include the following: "Vehicle equipment must be adapted to the weather conditions. This includes suitable tires and freeze protection in the windshield washer system."

Inform the customer that since 05/01/2006, he or she is obligated to adapt vehicle equipment, especially tires, to winter weather conditions.

For the winter operation, it is recommended to mount winter tires in the sizes shown in the parts certificate table.

Always applicable:

Equipping the vehicle with winter tires recommended in the Wheel and Tire Guide for winter operation is recommended.

The handling characteristics may be affected due to the use of winter tires the resulting changes in wheel and tire dimensions. For this reason, driving speed must be adapted to the changed handling characteristics and road conditions.

To attain best handling characteristics winter tires must be mounted on all-wheels.

If while mounting the winter tires, the vehicle is equipped with rims that are not factory-fitted, the following must be observed:

• Wheels and wheel bolts are coordinated to each other!
• When retrofitting to different wheels, the corresponding wheel nuts with the correct length and cup shape Cup shape explanations  must be used. The secure seating of the wheels and the function of the brake system depend on it!
• Winter tires with tread depth of less than 4 to 5 mm are only for limited use during winter operation.
• In some countries, at least 4 mm tread depth are required for winter tires.
• The aging process reduces the particular "winter characteristics" of these tires independently from the mileage.