Do you have the Dynamic Performance Control Option on the car?
I can't argue with you, because I've just ordered my car. But according to the BMW brochure, DPC can rotate the outside rear wheel faster than the inside wheel in hard cornering, thus reduce understeering and improving cornering speed.
If you have DPC, do you think it has helped in reducing the under steering?
IMO, the biggest benefit from the wider rear tires is the straight line performance. Specially on slippery or wet pavement.
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