Vinterdäck till cykel: ett jämförande test


The purpose of this study has been to compare the winter road grip of various bicycle tyres, as well as a pair of unstudded winter tyres, through cycling tests. In addition to grip, other characteristics that could be important to a cyclist, such as rolling resistance and wear resistance, were also tested.

The tyre’s grip on ice was tested by brake tests and manoeuvring tests indoors in an ice hockey rink. Four different test drivers were used to capture differences in driver behaviour, as well as to get a variation in the cyclist’s weight. The tyre rolling resistance was measured by indoor coast-down tests. Finally, the grip was tested on dry and wet asphalt by outdoor brake tests. Between the various tests, the studded tyres were examined with regard to the number of lost studs. In total, seven different studded tyres, two unstudded winter tyres and a summer tyre were tested.

The brake tests on dry and wet asphalt could not show any difference in performance between the different tyres. The winter tyres, studded as well as unstudded, had as good grip on asphalt as the tested summer tyre. In the case of ice grip, the two tyres with the highest number of studs, 240, were clearly superior to the others.

The rolling resistance tests showed differences between the different tyres and it is not the number of studs but rather the rubber properties and the puncture protection that has the greatest impact on the rolling resistance. The wear tests indicated that some of the tested models may be particularly prone to losing studs, but as the tests included only two samples of each tyre model, it is not possible to draw certain conclusions regarding wear resistance.



European Road Profile User's Group, ERPUG

Welcome to the sixth ERPUG meeting in Vilnius, Lithuania. 

Vision Zero for Sustainable Road Safety in the Baltic Sea Region

The second Vision Zero for Sustainable Road Safety in the Baltic Sea Region conference will be held in Tallinn, Estonia. VTI is part of the programme committee. 

ICTTP 2020

ICTTP, International Conference on Traffic and Transport Psychology, is held in Gothenburg, Sweden.



VTI contributes to study on older drivers and accidents

On behalf of and in collaboration with the Swedish Transport Agency, VTI has carried out a study of older drivers and the link between illness and traffic accidents. The Transport Agency has now published the results.


VTI in research programme Triple F (Fossil Free Freight)

VTI is part of the consortium that has been commissioned by the Swedish Transport Administration to conduct a research programme with focus on fossil-free freight transports. The programme, called Triple F, will run for 12 years. Part of the programme is...


Several actors collaborating on HCT vehicles

The increasing amount of freight, congestion on the roads and environmental emissions are problems that high capacity vehicles, HCT vehicles, can contribute to solving.


VTI’s simulators are being used for emergency vehicles

Better accessibility and shorter response times for emergency vehicles – this is something that standardised, directed, traffic messages, transmitted over the 5G network can contribute. Within the EU project Nordic Way 2, a functioning prototype of such a...


Modal shift - a way to achieve the environmental objectives

Shifting freight transports from road to rail and water can contribute to achieving the Swedish environmental and climate objectives by 2030. How this could be done is something that VTI researchers and researchers from Gothenburg University are investigating...


Report regarding government commission on the costs of traffic to society has been submitted

Since 2013, the Swedish National Road and Transport Research Institute (VTI) has had several government commissions to produce documentation on the costs to society caused by traffic. On 1 November 2018, the agency reported its latest commission, Samkost 3....