My thesis about summer and winter tires. An invention of the industry to make sales ? The only right point a winter tire has because of its profile more grip in snow but otherwise ? Claim: Summer tires in winter becomes hard because of the cold and the winter tires in summer softer because of the rubber mixture . The fact is that the winter tires slip just like the summer tires on ice and also on foliage because the tires do not slip on the foliage but the wet foliage on the road . Now to the rubber mixture, the tires rubs while driving and becomes very warm therefore the rubber is always warm not immediately at the start but after 1 to 2 km . A whole year tire has actually only both profiles . Due to the heat development the glue of the former round-renewed running surfaces which were also not glued . I drove in winter 2001 with summer tires to Switzerland and the car behaved like in summer, my colleague drives only with winter tires the whole year and the car keeps track even at high speeds in summer in the curve . All lug and deception ?