Originally Posted by moema535d' post='480303' date='Oct 11 2007, 08:09 PM

Careful - like most modern designs, the BMW front suspension has 'Negative Steering Roll Radius'. Among other things, this geometry improves straight line stability and helps stabilize the vehicle under braking in situations where the grip for both wheels is different. Normally, a car tends to pivot around the wheel with the higher friction level. With negative steering roll radius, this pivoting torque is cancelled out and the car stabilizes itself.

By going from 20mm to 15mm offset this radius is reduced by 5mm which will have an impact on above mentioned self stabilizing effect. Ever wondered why BMW offers various offsets for the rear wheels but always sticks to the standard 20mm for the various front wheels they offer?

Of course, if it is just about looks, please forget everything above.

Originally Posted by bad2bone' post='480297' date='Oct 11 2007, 07:45 PM

Yeah, go for non-run flats since RFTs won't fit on those wheels anyway.