I currently need to replace all four tyres on my Lexus IS and am seriously considering buying cold weather tyres. However, I will almost certainly be replacing my car next September when the current one is three years old. As far as I can see I have three choices. I can buy cold weather tyres and keep them on until I sell my car, but I am unsure what the disadvantages are of running a car in the summer on cold weather tyres. Or I can buy a set of normal tyres and forfeit the benefits of cold weather tyres in the winter. Or I can buy a set of cold weather tyres now and a set of normal tyres next April. This would obviously be very expensive and would only be a viable option if I was certain my next car had the same wheel sizes as my current one. My annual mileage is about 12,000 per annum.