they will have the same side wall height so its not going to affect the oversteer.
but they will have different sidewall strength, the 30 series is going to be stiffer, thus the traction breaking point will be higher
that is the answer I am looking for.
probably because it equals out the way the suspension is setup, plus the power has a great deal to do with how they keep the tires on the ground.
I'll bet theres some information about this somewhere in here:
http://www.seansa4page.com/resource/autotech.html