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The one thing that people don't seem to realise is that winter tyres have a different compound of rubber (ok plastic, made from oil not from rubber trees) in them. This compound stays flexible as the temperature drops where as summer tyres become stiff and inflexible at temperatures below 7 degrees. Also winter tyres normally are made up of lots of little blocks of rubber, these together with the greater flexibility of the compound, grip the road surface by moulding themselves to its surface. Whereas the summer compound tyres become stiff blocks that can't grip anything.
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