OK, so I'm set up for autocross with a stock suspension, plus a comptech adjustable front sway bar and r-compound tires. I'm very happy with this for autocross.

On the street, I don't plan on changing the adjustable sway bar. I already have my front street tires-- 205/55/16 S-03's. So I want to match them with some rear S-03's. Should I get 245/45/16's (which is definitely what I would get with a stock front sway bar), or should I get 225/50/16's (which might be more neutral with the stiffer front sway bar)?

Thanks!

 

I like the 205/55R16 and 245/45R16 for the S03. This will keep you in the same amount of stagger as stock. You could use the 225/50R16 front and they will also work with your set up but I do not see an advantage.

 

You don't think I'll get too much understeer with the stock stagger and much stiffer fsb?

 

I would recommend 225 Front, and 245 rear. Decreasing the grip available in the rear to compensate for the understeer induced by the bar doesn't sound like the best idea to me (you may be making the car more neutral, but at the same time you are decreasing overall grip). I would rather increase the grip at the front by going with a wider tire there, therefore 225. Then you would be making the car more neutral and increasing overall grip at the same time. Just like if you were autocrossing.

 

Not an option. I already have the 205's for the front.