It is recommended to use summer tyres, when the air temperature is above +7 C and more, to ensure the best adhesion to dry and wet road surface. Summer tyres have lower circulation resistance and noise level, and, comparing to winter tyres, harder rubber composition. In Latvian climate conditions, it should be necessary to change summer tyres to winter tyres approximately in the beginning or middle of October; however, it is possible to change tyres earlier – at the end of September. We do not recommend using winter tyres in summer.
Use of summer tyres is allowed between 1 March and 1 December.
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
summer tyres are not designed for driving all year round, in winter it is forbidden by law
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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