I have a 2003 325Ci Sport, 24K miles.

I had new rear tyres put on about a month ago, after the originals were worn
to about 2mm, the fronts still have 4mm on them. I have Dunlop SP9000s all
round, 225/40/18 front and 255/35/18 rear. I've done about 1K miles on the
new tyres.

I now seem to have a couple of issues:

a. on tight motorway slip road, and fast corners at speeds of 60+ mph, the
DSC light flickers and the DSC intervenes where previously I've had no
issue. The result of the DSC intervention feels unnerving.

b. the car now wanders at speed, requiring constant correction.

This isn't usual and not how I remember it - is this solely due to the new
tyres or is there coincidentally another problem ?

I didn't have the tracking done with the new tyres as there was no sign of
uneven wear - would this help ?I'm pretty sure by now the tyre release
coating would have worn off, so does anyone have any other ideas. Is the DSC
caused by the slight differences in tyre diameters ? I've thought about
replacing the fronts to see if that helps, but they've still got some life.

At the moment the beemer drives worse than girlies Pug 307 :-(

Rob.