Allright, I'm not looking for the answer of 1" or even in other units of measurement. How much of a performance / handling difference is there between a car that is using 6" wide wheels versus 7" wide wheels? I understand that the contact patch is bigger, but am curious just how much 1" really makes.

On a related topic, what is the purpose of ITC and ITB use 6" versus 7" wide rims? (I am not looking trying to get this rule changed) Is it there because the ITB & ITC cars were the founding cars and ran 6" wide rims, then SCCA wanted to make sure everyone wouldn't have to go out and buy 7" rims? Just wondering...

------------------
Dave Gran
NER #13 ITA
'87 Honda Prelude