Will I be ok if I put 215/50/15's on the front and 205/50/15's on the rear?
 

It is time for some new tires! I want to go with the BfGoodrich G-force sports again. I am considering putting 215/50/15's on the front and 205/50/15's on the rear. I heard by putting wider tires on the front, the car will oversteer more. This true? Also I have a 15x6.5 rim, will the 215's be ok on them? Will having a wider tire on the front effect the ride any? (make it twichy?)

Thanks guys!

The 215/50s will be fine on a 6.5" rim. Since the tires are the same model on each end, then the front will have relatively more grip available than the rear, at least compared to running the same sizes on both ends. Yes, the tendency to oversteer at the limit will be increased (or understeer decreased, sort of the same thing) compared to running the same sizes on each end.

The ABS system will deal with the small difference in tire diameters (the fronts will be taller). I've used two different diameters and widths briefly at the drag strip (trying two different sets of autocross tires out of curiousity) with no lights or wierd behaviour.

Hard to say on ride, but since the fronts will have slightly taller sidewalls the ride may be a bit better on that end. You'll just have to try it.

Scott
90SM

Scott covered everything, and I'm sure you've thought of this, but I wouldn't bother running different sized tires front to back (on the street) for the simple reason that you loose the ability to rotate them.. Unless you'd be willing to run the larger ones in the rear, which would be silly.

Putting the 215s on all four corners and playing with tire pressures would probably achieve the same end result.

I'd prefer to have more total available traction and tune for balance through suspension changes. If you need less understeer with your current setup, I'd first look to upgrading that 18mm sway bar.