I intend to put them on at the end of October and leave them on until the end of March. I bought a separate set of wheels for them. They work best at below eight degrees centigrade. They are not suitable for high summer temperatures that can actually reach 60 degrees plus on the road surface. You can buy compromise ‘all-weather’ tyres that you can leave on all year round, such as Bridgestone A01s. They're not as good as full winters like Michelin Alpins or Pirelli Sotto Zeros in snow and in very low temperatures, but a lot better than summer tyres.