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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Std 04 09 snow braking and ice braking tests test world ltd finland l.jpg

STD-04-09Snow braking and ice braking testsTest World Ltd, Finland


Objectives l.jpg
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 l.jpg
Snow braking at different temperatures, C

170 km/h

160 km/h

190 km/h

210 km/h


Slide4 l.jpg

Ice braking at different temperatures, C

160 km/h

170 km/h

190 km/h

210 km/h


Braking on wet surface l.jpg
Braking on wet surface

European winter

Nordic winter


Results snow and ice braking l.jpg
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 l.jpg
Average results – snow braking

European winter

Nordic winter


Average results ice braking l.jpg
Average results – ice braking

Nordic winter

European winter


Average results braking on wet surface l.jpg
Average results - braking on wet surface

European winter

Nordic winter


More about the snow tests why peaks when the temperature is the same l.jpg
More about the snow tests:-why peaks when the temperature is the same?


Snow braking two different days at 8 5 7 8 c and at 8 2 8 9 c l.jpg
Snow braking two different daysat -8.5/-7.8°C and at -8.2/-8.9°C



Reference tyres and temperature the srtt 14 varies most l.jpg
Reference tyres and temperature- the SRTT 14 varies most



Summary l.jpg
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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