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Vinterdäck till cykel: ett jämförande test
Swedish National Road and Transport Research Institute, Traffic and road users, Driver and vehicle.ORCID iD: 0000-0002-8242-3407
2018 (Swedish)Report (Other academic)Alternative title
Winter tyres for bicycles : a comparative test (English)
Abstract [sv]

Syftet med denna studie har varit att jämföra väggreppet för olika dubbade cykeldäck, samt ett par odubbade vinterdäck, genom tester med cyklist. Utöver väggrepp så testades även andra egenskaper som kan vara viktiga för en cyklist, så som rullmotstånd och slittålighet.

Däckens väggrepp på is testades genom bromstester och manövreringstester inomhus i en ishall. Fyra olika testförare användes för att fånga upp skillnader i förarbeteende samt för att få en variation av cyklistens vikt. Däckens rullmotstånd mättes genom utrullningsförsök inomhus. Slutligen testades väggreppet på torr och våt asfalt genom bromstester utomhus. Mellan de olika testerna så undersöktes dubbdäcken med avseende på antal tappade dubbar i syfte att utröna dubbdäckens slittålighet. Totalt testades sju olika dubbdäck, två dubbfria vinterdäck och ett sommardäck.

Bromstesterna på torr och våt asfalt kunde inte påvisa någon skillnad i prestanda mellan de olika däcken. Vinterdäcken, dubbade likväl som dubbfria, hade lika bra grepp på asfalt som det testade sommardäcket. När det gäller isgrepp så var det de två däcken med flest dubbar, 240 stycken, som var klart bättre än de övriga.

Rullmotståndtesterna visade på skillnader mellan de olika däcken och det är inte mängden dubbar utan snarare gummiblandning och punkteringsskydd som har störst påverkan på rullmotståndet. Slitagetesterna indikerade att några av de testade modellerna kan vara särskilt benägna att tappa dubbar, men då testerna endast inkluderade två exemplar av varje däckmodell så går det inte att dra säkra slutsatser angående slittålighet.

Abstract [en]

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.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2018. , p. 54
Series
VTI notat ; 20-2018
Keywords [en]
Bicycle, Studded tyre, Tyre, Icy road, Wet road, Test, Performance, Braking, Steering (process)
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 916 Road: Bicycles
Identifiers
URN: urn:nbn:se:vti:diva-13345OAI: oai:DiVA.org:vti-13345DiVA, id: diva2:1256908
Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2019-06-04Bibliographically approved

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Hjort, Mattias

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