Well, the new Donkinentals are working out just fine :) , although we've had next to no snow since I mounted them :rolleyes: .
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Well, the new Donkinentals are working out just fine :) , although we've had next to no snow since I mounted them :rolleyes: .
I've got some kind of Conti winter tires too, and they are doing fine as long as you take care.
As a side info winter tires are not made to be better on snow, the idea is to have a tire that performs better in terms of grip in the cold (under 7 degrees Celsius) than the usual summer rubber does.
Fixed ;)Quote:
Originally Posted by ioan
Winter tyres have softer compounds (to mantain friction at lower temperatures, where harder summer compounds "freeze"), and a more structured tread pattern, with plenty of sipes for better grip on low friction surfaces such as ice, snow, and "slippy" wet. :)
lots of differences on a nordic tyre and a mid-europe tyre.
the nordic tyre is softer compound, and has more sipes. remember that these tyres have to work in both +3 and wet ice to -3:) lots of grip in -30 thought!
i actually put a (probably) mid european continental tyre (ts810?) on one of my cars to test (volvo 850), and its better than summertyres, but nowhere near the nokian (hakka r) i normaly have there. but my other car, a volvo 945 turbo with hakka 7 is a much better car on snow and ice. easier to predict and know where you have it. this morning is was 18cm new snow, no problem to go to work!
Yes. Nordic tyres are designed for more extreme winter (lower temperatures, more snow and ice) than standard mid-European winter tyres. They are not as good as the standard winter tyres in wet or dry though.Quote:
Originally Posted by skarderud
I am not sure that the more structured thread is of any use on ice, not even on snow, maybe on slippy wet where it improves the evacuation of the fluid between the tire and road surface, but then again this is also the case on summer tires. In the end the friction coefficient is related to the material properties and not to the thread of the tire.Quote:
Originally Posted by donKey jote
Anyway you most probably knew this as you're the Conti man! ;)
Believe me, friction is also about tread pattern and the sipes help on ice and snow :)
Independent of the material properties:
With sipes -> more wheel slip = more traction on snow and ice
Without -> traction increases to a maximum at low slip and falls extremely rapidly
As a side: Nordic tyres have pretty much the maximum sipe density for this effect on ice. Increase it further and you lose again.
The friction coefficient is related to the tire and the surface and there are several grip mechanisms. Adhesion and hysteresis are strongly related to the material properties. Water evacuation or mechanical interlocking with the surface asperities or the deformable surface have less to do with the material and more with the pattern. Then you have pattern-compound-surface interaction, where the tread deformation and hence the surface contact depend on the compound hardness. I won't tyre you with the details ;) :p
Donks that looks pretty much like Ronspeak to me! :p ;)
I'm joking ofcourse.
It's 48 (8) and raining in Chicago. 286 days since the last measurable snowfall. Quebec had plenty of snow, but a policeman told me it's still warm since the shipping channel hasn't started to ice up. My poor Dunlops are going to have nothing to do but wear down.
I had a Continental go flat on my way to work yesterday:
http://imageshack.us/a/img822/7246/tireyz.jpg
Sorry, I don't have a donkey mask in my office, but I was able to borrow a horse...