I have thought about that too. My gut feeling is that a 7" rim is as narrow as you would want to go for a 225 width "street tire". It may not allow you to get the most performance out of the tire otherwise. You would have to do some testing to be sure.

 

41 h: Have you ever ran on the Hankook Ventus RS-2? I am thinking that you're right about a 225 on a 6.5 rim, this is not a good situation. I will stay at a 205/50 15 for now till I can get wider rims. I like the Falken 615's but they don't like heat and thought the Hankook would do better with heat than the 615's. Your thoughts?

 

I haven't personally used them. Based on everything I have heard about them they seem to be a very good ultra high performance tire, but not quite nationally competitive.

I am with you regarding a 6.5" width rim. I will stick with a 205/50/15 or 215/45/16 at the maximum. However, based on STS rules I think the ideal set up would be a 225/45/15 on a 15x7.5 rim.

 

Yea thats what I plan on doing as well. Now where could I find some 15 x 7.5 wheels there are not alot of choices out there...let the hunt begin!

 

www.18racing.com rota slipstream 15x7.5 $500 shipped

 

How much do those wheels weigh?

 

Well I found a new tire choice and it's simply amazing!! I went with the new 215/45 16" Kumho Ecsta XS and I'm glad I did. I did some quick tests to see how the tire is on grip and I was very surprised. With air temps at 47deg and the tires somewhat warmed (96deg) the tires were holding well at 1.15 lat G's with no squeel, I didn't have the nerve to go any further on a public road. This was .06 better than the Falken Azenis rt-615 in the best of conditions. I will post the results I get from my next autox on the 15th.

So far from what I'm feeling from this tire is incredible!!!

 

That's good to hear. I am leaning toward the 215/45/16 XS after I burn through my Dunlop Z1s.

 

That is the comparison I am waiting for, that or the XS vs. the RE-01R.

 

The RE-01R has been replaced by RE-11 (a good tire)

Kumho XS isn't that good a tire for ST class.

Dunlop Direzza Z1 Star Spec is good.

 

Too bad that the RE-11 has the same limited sizes in 16s.