tire size..does sidewall matter?

[gtstang8706]

Ok, so im really interested in some 18" chrome deep dish wheels for my 05 gt...Im looking at americanmuscle.com and I want 18X 10 in the back and 18X9 in the front...however, the rear tires are 275/40-18 and the front are 255-45-18. The sidewalls are a different size, but thats what they have.....is this ok? is it noticable? I know mixing tires isnt usually good, but theyre the same tire, just dif sidewall. I dont want it to look strange after spending that kind of money! Thanks for the help!

 

[kooldawg6]

That is odd...the fronts will be .3" taller than the rears I used http://www.wheelsmaster.com/rt_specs.jsp for the comparo.

 

[Mrgreen94gt]

To me, the slight difference in height on the GT500's is quite noticeable.
They use a 285/40-18 on the rear, which is slightly taller than the 275/40 but slightly shorter than the 255/45's on the front. I guess it depends on how sensitive your eyes are to that type of thing.

 

[LV51FER]

This is one of the best tire calculators I've found for working out the rolling radius:
http://www.tyretraders.com/Tyrecalculator/

 

[McQueens Dream]

we had those exact same sizes on ours for a while, with a 18x9 wheel, and it is noticeable. now we are running 18x9 wheels, with 255/45/18 front and 295/45/18 rear, a whole lot better looking...