AO Silver Member
Join Date: Nov 2003
Location: United Kingdom
County: Perth and Kinross
Re: winter tyres
Hmm, not the most factual link.
You already know that summer tyres do not work at low temperatures, whereas winter tyres have a softer compound which stays pliable at low temperatures. Also, the sipes, (hairline grooves) on a winter tyre encourage the tread to remain dymanic. Because it it thus less ridgid, and therefore has more grip in low temperatures, the tread block movement creates heat to help stop the tread cooling and becoming too ridgid to grip.
The downside to this is higher rolling resistance. The tyre can be noisier, but the sipes are actually quite good at reducing tyre noise. A winter tyre also overheats more readily when used hard in warmer weather. The less rigid tread blocks also limit dry cornering adhesion in warmer weather.
As a rule of thumb, the temperature where a winter tyre will perform better than a summer tyre is about 7 degrees.
[SIGPIC][/SIGPIC]Drive sideways- life's too short not to
Slip-sliding my way through winter. On four wheels and two.