hi, short history: I drive a mini cooper cabrio r52. I bought and had the winter tires mounted on original mini wheels at bmw. already in the first year I was surprised that I could not drive up a not cleared bigger climb with new winter tires. last year I was made aware that 2 matures are incorrectly mounted. I always change the matures myself, but go very carefully ahead and I am sure that the error lies with bmw! the matures have between 10,000-15,000 km now down, are 4 years old but still have decent profile! what do you advise? here is always written you should only mount them properly. or should I prefer to raise new ones?