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That'll be the camber on the rear.
Even standard BMW's suffer this to a degree.
If you've lowered the car, or put wider wheels on, or both - you need a 4 wheel alignment (on a Hunter machine, or similar) to get it all set up properly.
The 4WA checks all the geometry is correct - tracking, camber, castor and the alignment between the front and rear wheels.
Regular tracking check, just makes sure both front wheels are pointing the right direction.
Even when set up, the camber will still wear the inner edges.
Nationwide Tyres often have Hunter 4WA machines.
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