What size tire to match fronts size ???

I currently have 18" X 9.5" Z06's all the way around on my Z28 .
I am buying two 18" X 10.5" Z06's for the rear . I want a 315 size
tire for the rear but unsure about exact size to get them to match
the front tire size . What size tire for my new 10.5" Z06's to match
my front tires ? Thanks :)

What size are your front tires?

If you are running a 275/35R18 in the front you would want something like a 315/30R18 for the rears.

A 265/40 up front and a 295/35 in the rear would match up too.

Oh damn sorry I left that out :o My front tire sizes are
275/40/18 :)

Those are about a 26.8" tall tire. The closest you would be able to get would probably be a 295/35/18 at 26.2"

Would a 315 be too wide or something ? I want some tire bulge
goin on but not too much :D

On a 10.5 " rim. No. The 315 is a very good match for a 10.5" rim.

The 275/40-18 is 1" larger in diameter than the stock 4th Gen tires (at least if you had the Z-rated tire option). Its really a Corvette tire size, not an F-Body. 275/35-18 front, with 315/30-18 rear would be a better match. They would be slightly smaller in diameter than the stock tires.

I already have 275/40/18 Nitto's on the front . Im just looking
for a good rear size to match the front tire sizes . I dont wanna
buy two more front tires cuz theyre still pretty much brand new.
What size for the rears would match the fronts best ? I know
I want something in the 315 area . :)

Problem is a 315/30-18 is a 25.5" tire, more than an inch smaller than the tires you have on the front now. It's a Porsche tire size, and expensive ($400 each). Can't find a 315/35-18, except in a road racing tire. Can't find a 305/35-18, at least not at Tire Rack.

Either put the 315's on, knowing its going to be a bad match until the 275/40's wear out, or limit yourself to the 295/35-18, which is still going to be on the small side.

Problem is a 315/30-18 is a 25.5" tire, more than an inch smaller than the tires you have on the front now. It's a Porsche tire size, and expensive ($400 each). Can't find a 315/35-18, except in a road racing tire. Can't find a 305/35-18, at least not at Tire Rack.

Either put the 315's on, knowing its going to be a bad match until the 275/40's wear out, or limit yourself to the 295/35-18, which is still going to be on the small side.


Damn I had no idea the tires i picked were gonna limit my options
this bad . Thank you very much for all your help .


EDIT: Made new post below

I just found a 305/35/18 Nitto tire . How well would this match the fronts and
would it look good ? (as in sidewall bulge , wideness , etc .)

http://www.americanmuscle.com/nitto-nt555r-305-35-18.html

I just found a 305/35/18 Nitto tire . How well would this match the fronts and
would it look good ? (as in sidewall bulge , wideness , etc .)

http://www.americanmuscle.com/nitto-nt555r-305-35-18.html

That would be closer to the 275/40/18 but still about .20 inches smaller. Listen to Injuneer, he def knows what he is talking about.

To back him up, if I were you I would try to get rid of the 275/40 and get some 275/35. They are more size friendly on the F body.

If you do want to stay with the same size, those 305/35R18's would probably be your best bet.

I just found a 305/35/18 Nitto tire . How well would this match the fronts and
would it look good ? (as in sidewall bulge , wideness , etc .)

http://www.americanmuscle.com/nitto-nt555r-305-35-18.html

You didn't mention you were looking at a Drag Radial. Are you sure you want to run that on the street? If you are OK with the reduced wet weather traction, the small difference in the sidewall height (about 1/10th inch) will not be noticable.

You didn't mention you were looking at a Drag Radial. Are you sure you want to run that on the street? If you are OK with the reduced wet weather traction, the small difference in the sidewall height (about 1/10th inch) will not be noticable.


The car only comes out on nice days so im not too worried about
the wet weather :) How much smaller in width is the 305 vs. 315 ?
Im assuming about 1/2" ? Sorry for all the questions im just picky
about my car :o

BTW thank you both VERY much for all the help :) It helped
out a great deal :thumb: :)

A 315 tire has a tread width of 315mm.
A 305 tire has a tread width of 305mm.
Net difference is 10mm or 1 cm which is 1/2.54 of an inch or about .4 inches.