The stock diameter's are 26.9" and 26.5", the goal is to try and stay close to these values.

The RE-11 255/35 is too short at 26.0", the 265/35 is a bit closer at 26.3".

I don't have specs on the 285/35 but I'm estimating it to be roughly 26.7". The size differential would be roughly the same as stock in this case.

Got it. The RE11 285/35 are 26.8 in diameter. With this setup will i still benefit from sways?

That was my point with going with the 255/40s since that gives you just a bit over 27" diameter. I am considering hankook v12's which you can get in this since. Not sure about the RE11's. The 255/35s are too small and I though that may affect the performance, since the front wheels will essentially spin more than the rears. Anyways, that was my question... and two cents.

That helps me out.. THX!

yeah I hate tire shopping, I also do not know a lot about tires.

Yes you can still benefit from sway bars. Sway bars benefit most in the medium speed corners by reducing body roll and make the car feel very planted and balanced. The Stillen sways are a good aggressive street upgrade, the Hotchkis work well on track but are a bit of a compromise on the street.

^That's why I went with the Stillen bars; I could not feel the difference in everyday street driving but once you start pushing the car through technical roads, it is far more planted through transitions as well as giving you quicker turn in and a little better rotation depending on the which setting the rear sway bar is set at.

Cool deal. THX ALL!

I plan to go with 255/40 fronts and 285/35 rears to get the overall diameter close to what the stock stagger is. However, I was told by the tire shop that I want a smaller tire in the front than in the rear......which I don't understand since the factory front tires are taller than the rear tires with the sport package?

You're tire shop is full of crap. The size stagger is a Corvette thing, the Z has equal sizes front and rear, and a slight differential either way doesn't matter.

Sounds like they are trying to unload invetory instead of ordering what you really want. That's my guess.

Yeah, he jumped on my case when I was asking to order the 255/40 fronts to go with the 285/35 rears saying he was a "long time gearhead, and you never have taller tires in the front of a sports car". I knew he was wrong about this with the 370 and I will not be doing business with them because of this.

tweb09.. what tires are you planning on running?

I will be getting the Hankook v12's.

o.k thx...