Dear Forum, I would like to know how big the differences in the wheel circumference between front and rear tyres can be. Specifically, the following tyres are mounted on my BMW 1er (F20): Front: Dunlop 225/40 ZR18 92Y (Sport MAXX RT2 XL) Rear: Dunlop 245/35 ZR18 92Y (Sport MAXX RT2 XL). These tyres should be almost identical in the wheel circumference. When I recently monetized my winter tyres and put the summer tyres in “their corner”, I noticed that the V The rear wheel tire is certainly 10-12 mm smaller in diameter. On the attached picture with the water scale is the tire on the left of the front wheel tires, on the right of the rear wheel tires. It is always said that 2-3 mm difference in the profile can lead to worse driving characteristics. But here is clearly more difference. All four tyres were mounted only about two months ago. t and still have almost full profile. They replace four Michelin Pilot Super Sport in the same sizes. I have never noticed before that the tires have such an obvious difference in diameter. Is this also the case with other vehicles / tires?