Originally Posted by HighlandPete
Nothing with passive suspension to change... this has been an issue for many topics across the BMW model ranges. F10/11 users had this debate (first of the models), users thinking the passive suspension had some active parts. Completely dismissed by BMW, as not meaning suspension when 'chassis' is referenced on the iDrive menu, without adaptive damping being in the specification. Steering tightens up and that can feel as if there are some suspension changes. You definitely need the adaptive damping package to be able to change the suspension settings.
Ok I think I understand, I did some searching on the f10 forums and a post from Jon D said this:
If you have 'sport' configured for chassis only it stiffens the front and rear roll bars, changes the damper rates and quickens the steering response.