All-season tyres ensure admissible safety level in winter and sufficient comfort in summer. However, one should note that, in comparison to winter tyres tread of all-season tyres will wear faster in summer. Such tyres will be appropriate, if you drive daily in the city and on well-cleaned streets.
Sometimes, all-season tyres can be a compromise between summer and winter tyres. Such tyres have “all season”, „4S” (four seasons), “tous terrain” (all surfaces) or “AW” (any weather) marks – only such tyres may be considered as all-season tyres.
Use of all-season tyres is allowed during the entire year.
Wear indicators
Minimum allowed tread depth, provided for in Latvian legislation, is 4 mm for winter tyres and 1.6 mm for summer tyres. Remember – tread depth affects tyre functions!
Tread design
Symmetrical
Rotation direction should not be observed when assembling
Optimum indices in all parameters
Asymmetrical
Internal/external edge principle should be observed, when assembling
Used in manufacturing of high performance tyres
Internal edge drains water and wet snow, but the external edge ensures good adhesion in straight direction and in turnings
Directional
Rotation direction should be observed, when assembling
Good indicators of draining of water and wet snow from the contact area
attention must be paid to marking of all-season tyre
225 – tyre width (in mm)
45 – tyre height (percentage of tyre width)
17 – tyre diameter (in inches)
91 – tyre load index
Y – tyre speed index
Marking "E" - tyre complies with EU or UNECE standards. Figure indicated after the letter "E" indicates the country, which approved the tyre.
Marking "S" - level of noise produced by the tyre complies with EU or UNECE standards.
Tyre pressure
Adequate
Correct pressure ensures 100% tyre performance, even contact with road and wear. It is possible to specify recommendations on tyre pressure in car manual or on the sticker on the shell of the car, near driver’s door.
Insufficient
Insufficient tyre pressure makes driving a car more difficult, and tyres get worn and hot to larger extent. For example, pressure decreased per 20 % reduces life of a tyre per approximately 80%. If pressure is insufficient, breaking distance of a car increases as well.
Increased
Tyre touches the road surface only with middle of tread, thus increasing wear of central part of a tyre. Area of adhesion to road surface increases, thus negatively affecting safety.
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