17x8.5 vs 17x9 How much of a disadvantage is there in an autocrossing sense?

I can't use as big of tires with the same steering response. What else is there?

 

Bigger difference in tire compound choice and suspension set up than the 1/2" difference IMO.

 

Are you planning to compete in autocross or just have fun and learn? There are certain rules one must follow, and usually either a 245 or 255 tire is max width. Also, in autocross, it is probably better having a lighter, narrower wheel, like a high offset 8.5. This is why a decent amount of competition autocrossers like the OZ Racing 17x8.5 +59 wheel. Also, in autocross, a 245 vs 255 probably doesn't make much difference...a 245 in a better tire compound will be better than a 255 in a lower compound. Also, saving that width and 1/2" may make for a lighter setup.

If you are planning to road race/HPDE as well, you might want to go with a 9" wheel.

What's your driving experience level?

 

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Haha didn't mean to blow up the thread. Maybe I should of just said a simple straight to the point answer.