From my X type experience different tyres can cause severe handling problems. My car was fitted with Pirellis Assimetricos from new, but it started handling very badly.
I found out there was a tech bulletin for possible problems with X type front suspension, mine was checked during a service and all was fine. The front wheels were swapped around and this improved things for a few thousand miles.
At about 13,000 miles the handling went crazy - tramlining and following cambers - at slow speed it would steer towards the kerb and the steering wheel would judder slightly. I took it in for the tyres and suspension to be looked at. On taking off the front wheels the inside block of tread on the both tyres were just legal, the rest of the tyre was at 2.5mm and had even wear. Tyre balance and tracking were fine.
I ordered repalcement tyres and as soon as they were fitted the handling was back to normal.
The replacement tyres were Goodyears and these wore evenly across the whole tread (they only lasted 10,000 miles, but that's another story!). I swapped them again for Pirelli 6000s, handling was fine and tyre wear was even across the tread up to me swapping the car.
This showed to me the bad handling was being caused purely by the tyre choice and this became a vicious circle. Uneven wear was changing the camber setting, which was causing handling problems, the incorrect camber due to tyre wear was causing more tyre wear on the inside edge making the camber worse and this was making handling worse.
So my advice is to check tyre wear and consider another type. If the rear tyres have a lot more tread than the fronts swap them and see if this makes a difference.
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