As many of you know, we are taking an SM and converting to ITA. I was wondering what others have experienced in terms of lower powered cars and tires size. I will be running 9lb 15x7 SSR's with a 4.88 rear. I figure I have 2 choices in tire size - 205/50 and 225/45.

I see so many lower powered ITB and ITC cars with as much tire stuffed on those 6" rims...and most ITA cars run 225's on their 7's.

Anybody actually run the smaller tire with data to back it up? I really think the Miata is going to work better with the 205's on it as it really won't have a crazy amount of power compared to the Nissan 2L's and the Honda 1.8's. Many have said that on the bigger tracks the rolling resistance is really a factor of a bigger tire.

We have both here, NHIS and LRP are small and twisty with low top speeds while WGI and Pocono run big numbers. Maybe I will have to run 2 set-ups.

Thoughts and experiences?

AB