That's interesting because on the Continental UK website they say this:

Quote:

There is a slight trade off with stopping distances as a winter tyre does not stop as quickly in the dry as a summer tyre, however, on balance if it is not possible to switch tyres in the winter, experts say you are better off with winter tyres all year round. This is because the difference in stopping distances of summer tyres in winter is far greater than for winter tyres in the summer.