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

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

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

  2. 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

  3. Snow braking at different temperatures, C 170 km/h 160 km/h 190 km/h 210 km/h

  4. Ice braking at different temperatures, C 160 km/h 170 km/h 190 km/h 210 km/h

  5. Braking on wet surface European winter Nordic winter

  6. 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.

  7. Average results – snow braking European winter Nordic winter

  8. Average results – ice braking Nordic winter European winter

  9. Average results - braking on wet surface European winter Nordic winter

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

  11. Snow braking two different daysat -8.5/-7.8°C and at -8.2/-8.9°C

  12. Snow braking – variation SRTT

  13. Reference tyres and temperature- the SRTT 14 varies most

  14. Reference tyres and temperature

  15. 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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