In Nov. 2011, Autocar tested Michelin Winter & Summer tyres at the MIRA facility when the ambient temperature was 10ºC.
There's a good technical explanation from Michelin as to why the Winter tyre took 7.1m or 14% longer to stop in the wet braking test compared to the Summer tyre.
You can watch the video via the above link or at youtube:
Reading the comments on the video (via Autocar's site not youtube) it would seem that the Winter tyres outbraked the Summer at 4ºC. Which was to be expected, but I was surprised by the change around at 10ºC (the temperature this afternoon in Portishead).
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