I own a 03 350z, of course, I have the tire feathering problems. I want to get a new set up of 18x8.5 245x40x18 all the way around, so I can rotate the tires. Does any one have a similar set up? I also take my car to the track, Does anyone have a good suggestion on the size of the rims?

 

That doesn't some like a bad setup. However, may I recommend a Hotchis adj sway bar system. That will allow you to tune out oversteer or understeer with that setup.
If you already have some adjustable sways ignore this post.

I was thinking the same thing but 17" @ 255-45-17 all the way around. I might have to go with 245-45-17 but that would work as well.

 

I might do more upgrade on suspenion in the future, since I am only a beginner for racing. Thanks for your advise!

 

eddie

welcome to forum
as per your question about running 245/40/18 all around
this would improve handling and allow you to rotate all four
however, if your vehicle has TCS/VDC, the electronics may not be happy with your choice. if you dont, go for it
if you decide to run a staggered setup, you can still rotate left to right, just requires dismounting of tires and reversing them

a better solution to the tire feathering is proper alignment and/or through the use of aftermarket suspension components, then you won't eat through tires

hope that helps
pp