I have 17X10.5 wheels {front and rear} and have ran two sets of Yoko 032s and have been relatively pleased with them. The Yokos have a minimum wheel width of 10.5 inches. I know they would work better on 11s but hey, they did seem to work better than 275s.

It's time to buy tires again and I'm thinking about changing brands and I have a few questions. Keep in mind that I drive to the events on the tires and drive a small amount on the street {less than 10K miles last year}. I try to do a few autoXs {less than 10} a year and I'm going to give open tracking a try this year

What does everyone think about using either 315 NittoRIIs or 315 Kumo V700s? I know either tire's minimum width is 11 inches but sometimes things just work out even if the specs don't add up. I think that Kumho has a 305/40/17 or maybe a 295/40/17 {can't remember} size in their V710. They would fit the wheel perfectly but I'm a bit worried about driving the new V710s on the street. I think that they would heat cycle pretty bad.

Any advice before I blow near a grand on tires would be greatly appreciated.

i would run anything from a 265 to a 315....

my preference would be a 275/40 for those wheels

Not sure if you want a race only or a race/stree tire but Kumho has the new 710 in a 295/40-17 and suggests a rim between 10-11.5. It will be a little bit taller than a 275, but not by much.
710

315 Nitto 555RII do not exist yet.
So your other options are Kuhmo V700 Victoracers or Go with the Yoko again... but remember that the Yoko also offers 2 compounds: A032R-H and A032R-S... which one were you using ?

I have been running the original {now hard} compound. I am pretty interested in the 295/40/17 Kumo V710s but I'm a bit worried about their longevity given that I will be driving to the events on them. As I said, I really don't put too many street miles on the car, I'm more worried that the tires will harden from multiple heat cycles.

Unless the Nitto 555 RIIs come out pretty quickly,, I think I'm going to try the 295 V710s. At least I'll find out for sure about the longevity issue. Does anyone think that the maginally taller sidewall will result in less precise handling?