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Nya och begagnade vinterdäcks friktion på våt slät is: undersökning avseende inverkan av ålder, mönsterdjup, slitbanehårdhet, dubbutstick och dubbkraft
Swedish National Road and Transport Research Institute.
2004 (Swedish)Report (Other academic)Alternative title
The friction on wet smooth ice for new and used winter tyres : An investigation concerning the influence of age, tread depth, tread rubber hardness, stud protrusion and stud force (English)
Abstract [sv]

It has been argued that the grip of winter tyres on ice and snow deteriorates

with age to such an extent that winter tyres above a certain age e. g. 10

years should be forbidden to use. Little research data do however exist. This

investigation has been carried out by VTI in order to get a better background

for legal decisions. The results would also be of use for ordinary consumers

as a guidance. This investigation that was carried out on wet smooth ice is

the third of three part studies. The first was on smooth ice at -3°C and the

second on rough ice at -3°C. They have been reported in VTI meddelande 923

and VTI notat 34-2003. The aim of the investigation is to investigate the

correlation between ice grip 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 23 studded and 42 non studded winter tyres

and four summer tyres mainly of the in Sweden popular brands Gislaved,

Michelin and Good Year, primarily of size 195/65R15. Most of the tyres had

been driven in ordinary traffic and were manufactured from 1981 to 2003. A

small number of new winter tyres were also tested. As reference some new

summer tyres were tested as well. The steering and braking performance of the

tyres has been measured in a special climate controlled indoor high speed

flat bed test facility developed by the VTI. Very good correlation has

earlier been found between results from the facility and lap time results

from ice track circuit tests with cars as well as pure braking and cornering

tests with cars on ice tracks. No age related deterioration of the ice grip

was found for the fully studded winter tyres with stud protrusion 1 mm and

higher. The ice grip deteriorated with increasing age for non studded winter

tyres and studded tyres with stud protrusion less than 0,9 mm. The results

also show that on wet smooth ice studded tyres with stud protrusion 1 mm and

higher are much superior to non studded tyres including the specialised

studless winter tyres often called "friction tyres". The differences in

friction within the groups are however quite large.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 965 , 2004.
VTI meddelande, ISSN 0347-6049
Keyword [en]
Swedish, Sweden, Studded tyre, Icy road, Wet road, Friction, Deterioration, Age, Depth, Winter, Rubber
Research subject
Road: Vehicles and vehicle technology, Road: Components of the vehicle
URN: urn:nbn:se:vti:diva-5144OAI: diva2:673974
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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