Originally Posted by
Chip42
for the time being, operating under IT rules means operating under IT wheel width rules. that pretty much locks you into a 205, MAYBE a 225 on a 6" rim in ITB and C and 225 MAYBE larger in ITA and S. R can get a lot bigger, maybe 245 on an 8.5" rim.
I agree in theory with Mike, though. long term, if this takes off, you'd want to lock the class to a max section width not a wheel width. this could be done today in some localized sub rules, but the gentlemen's agreement version of things will want to keep existing rules until they have a leg to stand on in terms of demonstrated participation counts. this means that ITB and A are likely to be the bogey classes for the success of the gentlemen's agreement as they are most likely to work well on these wheel/tire fitment options.
agreed on 180TW. though I think 200 is probably good enough in terms of fitments, I'd want to maximize crossover and rules equality between these ideas and established TW rating minima as much as possible.