Hello, we drive on our Mini Cooper 205/45 R17 with the uncomfortable Runflat tyres with the normal chassis. I am now considering whether we could switch to an unregistered special tyres such as 205/50 R17 or 205/55 R17 (to standard ET 48). I am already aware that the tire circumference would change and a (if possible) speed adjustment would be necessary. Advantages: More comfort Better look, the wheel houses would then be more filled protection of the rim horns Disadvantages: Machbarke It? If yes, individual acceptance at the Tüv? Tachojustage costs Changed rolling circumference of the wheels –> Effect on acceleration, elasticity….. ….. Do you have ideas for the possible implementation greeting walterbusch