Can winter tyres be used at temperatures above 7°C?
Yes they can, 7°C is generally used as the point at which winter tyres start to perform better than summer tyres. The 7°C guideline isn't a 'switch' but rather a tipping point, the further away from 7°C the temperature moves (either way) the more effective winter and summer tyres become relative to each other. However winter tyres can be used at temperatures above 7°C. Below 7°C, braking distances are shorter on wet roads with winter tyres. Even at 30mph there are significant braking benefits when using winter tyres on snowy roads. At 20mph winter tyres would stop the vehicle 11 metres sooner on icy roads.
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