std 04 09 snow braking and ice braking tests test world ltd finland
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STD-04-09 Snow braking and ice braking tests Test World Ltd, Finland. Objectives. Test the performance of 8 winter tyres, consisting of tyres designed for both Nordic and milder winters, and to compare them with the SRTT 14’ and the ASTM 16’ tyres.

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Presentation Transcript
objectives
Objectives
  • Test the performance of 8 winter tyres, consisting of tyres designed for both Nordic and milder winters, and to compare them with the SRTT 14’ and the ASTM 16’ tyres.
  • Find the performance levels of different tyre types
  • Find the performance limits of premium and low quality tyres
  • Check the performance on ice, snow and wet asphalt
  • Test the effect of test conditions, having tests made in a range of different temperatures
  • Have information about the reproducibility, by repeating the tests also in same temperatures
snow braking at different temperatures c
Snow braking at different temperatures, C

170 km/h

160 km/h

190 km/h

210 km/h

slide4
Ice braking at different temperatures, C

160 km/h

170 km/h

190 km/h

210 km/h

braking on wet surface
Braking on wet surface

European winter

Nordic winter

results snow and ice braking
Results: snow and ice braking
  • The main challenge is that in some tests and conditions, some tyres behave very differently, but only some.
  • The temperatures have an effect for the above, but not always. The conditions have different effect to different tyres. Some tyres perform better in low temperatures, some in high temperatures.
  • The main conclusion is that it is vital to do the tests more than once. Probably at least 3 times, each in different day and temperature. The average would give a good view of the tyre performance.
  • When tested only once, it is possible to get almost any result for a certain tyre.
average results snow braking
Average results – snow braking

European winter

Nordic winter

average results ice braking
Average results – ice braking

Nordic winter

European winter

average results braking on wet surface
Average results - braking on wet surface

European winter

Nordic winter

summary
Summary
  • Braking performance on wet asphalt and on ice are contradictory qualities
  • The behaviour of the reference tyres varies more than desirable
  • It is vital to do the snow braking tests more than once. Probably at least 3 times, each in different day and temperature. The average would give a good view of the tyre performance.
  • When tested only once, it is possible to get almost any result for a certain tyre.
  • To get a correct general impression of a tyre one needs information about braking performance on both snow, ice and wet surface
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