Nya och begagnade vinterdäcks isfriktion på skrovlig is: undersökning avseende inverkan av ålder, mönsterdjup, slitbanehårdhet, dubbutstick och dubbkraft

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Olle Nordström

The aim of this investigation is to investigate the correlation between grip on rough ice of winter tyres and their age, tread depth and tread rubber hardness and for studded tyres also stud protrusion and stud force. The investigation comprises 22 studded and 42 non studded winter tyres and 4 new summer tyres mainly of the in Sweden popular brands Gislaved, Good Year, Michelin of size 195/65 -R15. Most of the tyres had been driven in ordinary traffic and varied in age from zero (2002) to 21 (1981) years. Tyres from 1994, 1988 and 1982 only used in earlier investigations on ice and on wet asphalt were also tested. In addition a small number of new winter tyres and as reference some new summer tyres were tested as well. The tests were carried out in the autumn 2002 on rough ice near zero degrees centigrade (-3°C) as complementary tests to those on smooth ice carried out in the autumn 2001 which are published in VTI Meddelande 923.

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