Ok, on my 97 Z28 I have 18x9.5 in the rear and 17x9 in front. If I could do it again I would put 9.5 or 10 all the way around and same diameter, but I got a really good deal on these wheels several years ago when I bought them from my work. So, anyways, here's the deal... I am autocrossing the car alot more now and I am ready for new tires in the front. I have been understeering with 255s on the front and 275 out back, so I am wondering would it be wierd if I had a 275 up front on the 17 and the 275 18 in the rear? I know it would take care of my understeer problem, but I just think it might look odd. Usually when you have staggered diameters you also have narrower tires in the fron than the rear. I don't know, what do you think?

 

With the 9 and 9.5 inch widths you'll give off the appearance of a slightly bigger tire in the rear.

Which tires are you running?

 

Well, this is the thing, I have relatively new 275 35 18 Kumho MX on the rear and old cracked edge used BFG 245 45 17 in front. I was going to sell the car several months ago and the front tires were down to the threads so I grabbed those for $20 from my local tire guy. So, right now I have BIG understeer, but also had it before when I was on the 275/255 Kumho Ecsta Supra combo.