This marking prescribed by the EU for vehicle tires relates to fuel efficiency, wet grip class and external rolling noise with the corresponding measured value. The values are to be attached to a 75 × 110 mm label on the tire or to be added to the item of a tire set (for dealers: a batch) as a label. Customers can also find the information in the technical advertising material. The tire label ranges from the green “A” category to the red “G” category.
Rolling resistance: This crucial parameter has an immense influence on fuel consumption. Category “A” tires consume 0.1 liters less fuel per 100 km compared to the next category “B”, category “G” may lead to an additional consumption of 0.66 liters for the entire vehicle (cumulative additional consumption) .
Wet grip: Cars with “G” tires can have a braking distance of 18 m longer than those with “A” tires.
Rolling noise: Here the marking is done with one to three stripes and a decibel indication. One stripe means the least amount of noise, more than 3 dB (A) compared to three stripes – per tire, mind you.
Your year of production can be read from the DOT number (last digits). In addition, they must have the necessary profile depth (see below). Your age and the tread depth do not have to correlate directly, because if you have not been driven much, the tread may still be correct. However, the quality also suffers when the tires are idle, and the compound becomes crumbly over the years. No car tire should be over five years old. Winter tires should not come from cheap suppliers and from China, and most all-season tires received less good marks in the test. They are really only worthwhile in the absolute flat country, on slightly hilly terrain they threaten to go crazy when it is really slippery.