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Nya och begagnade vinterdäcks isfriktion: sammanfattningsrapport. undersökning avseende inverkan av ålder, mönsterdjup, slitbanehårdhet, dubbutstick och dubbkraft
Swedish National Road and Transport Research Institute.
2004 (Swedish)Report (Other academic)Alternative title
Friction on ice for new and used winter tyres : summary report. An investigation concerning the influence of age, tred 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. It comprises three part studies on different surfaces, wet

ice, smooth ice -3ºC and rough ice -3ºC. 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 20-23 studded and

33-43 non studded winter tyres and four summer tyres mainly of the in Sweden

popular brands Gislaved, Michelin and Good Year of size 185/65-15,

195/65/-15, 185/70-14, 165-15. All were radial tyres manufactured between

1981 and 2003. Most of the tyres had been driven in ordinary traffic. 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. The new winter tyres were clearly better than the average of

the older tyres. In the age range 5 to 15 years however no significant

influence of age on the ice friction of winter tyres could be found

regardless of if they were studded or not. The results also show that on this

surface studded tyres as a group still are superior to non studded tyres

including the specialised studless winter tyres often called "friction

tyres". The differences in friction are largest on wet ice and smallest on

rough ice. The test results from this investigation do not answer the

question whether or how the performance of a stored unused tyre is reduced

with time. Results from an earlier investigation by VTI showed no

deterioration within three years of storage.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 966 , 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-5145OAI: diva2:673975
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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