I start them at 38F ... 40R and those temps shift quite a bit. Unlike other folks around here I like to run them even at 45 hot.

Thanks Jeff. What type of ambient air temps do you see when you start them that high? I like your benchmark of ~45 hot; I was 48-49 with NT01's based solely on thermals - that's where the tires seemed to like to be.

I too run my NT-01s close to 40 psi cold, seems to work well.

You guys run wicked high pressure. What sort of difference do you feel between say 40 psi hot and 45-48 psi hot.

I ran my R1's and my R888's at 38-40psi hot. Any higher and the car was sliding around.

pressures are pointless w/out tire size. IIRC Jeff runs a 255/40R17, JID runs a 265/35R18, which I also run. I don't have a lot of time on my R1s yet, but running them at 40-42 psi hot seemed to work ok. Need more track time to hone in on the right setup, though.

l8r)

I'm on 255/40R17 as well

Those hot tire pressures do seem quite high. In a couple of weeks I will be testing the pressures on my R1's around 38-40psi hot in front and 42-44psi hot in the rear.

This is a 255/40-17 on a 17" by 9" wheel.

I think the 17X9 is a good choice for the 255. I saw abnormal wear running them on the OEM BBS rims. They worked great but needed to be unmounted and flipped to get full life out of them. I also saw some lower control arm polishing which made me a bit uncomfortable.

This year I moved to the Hoosier R6 in 245/45/17. They fit better on the 8" rim and provide a tad better gearing for the EVO9.

Back from the dead now that the NASA cont's have changed quite a bit this year. Updates/thoughts/is it worth the risk.

I just picked up a set of 285 R1's with one heat cycle on them. I'm excited to try them out. These are one of the few dot-r's I haven't tried yet. I do see that they are a little wider then A6's in the same size. At least before mounting!

Ya I think that's why Nasa made it a +13 tire because they're one of the biggest offenders for "undersize" labels lol. But i've been all over this recently. The bullet points:

- The compound has changed since mid 2011 to a more progressive and forgiving compound. They "claim" it'll last as long as the old R1 but with grip like the A6..not my words. The "old" compound is still out there though.
- Even WITH that, they will last 3-4 cycles longer then a set of R6's
- There is a 265 size available which is about perfect for those that run 9.5" wheels, which is most everyone.
- The NASA program pricing is VERY attractive.
- The NASA 2 tires for 3 starters is VERY attractive.

The rumor mill is that they're getting beat up big time over TT, but they're sticking to their guns on just doing the race groups this year with TT a "strong possibility" next year because they're putting all their stock into the "SPEC Z" class and the other racing groups. Also, unlike hoosier, they don't control the pricing of the tire the vendors give out, which is making the pricing go all over the place if you shop around.