I have just changed my rear tyres for Falken 225 45 17 tyres, I changed to the different profile to make them a little less expensive.
The front two tyres are still the Goodyear NCT5 with approx 3mm of tread left, on the original profile of 215 50 17
Since swapping over the handling of the car has been awful
The car seems to track all over the road, hitting a corner at more than 50 and the car is like its on castors, the rear end feels like it will step out at any time even at that low seed.
At higher speeds the steering becomes very twitchy, almost feels like any small movement on the wheel could send you in a spin
Is the problem the two differing profiles or tread patterns(I know BMW fit wider wheels at the back) so can't see why