biged3

The 2005 GTs come with 17x8 rims with P235/55ZR17 tires. I was thinking of going with some 18x9 rims when I get my '05. What size tire would I need in order to keep the same diameter so I don't mess up the spedometer? Is there a formula or trick to finding it out? Thanks.

biged3

Another question. does anyone know of a website where you can see wheels on the new Mustang? I know discounttire.com has a tool to do it, but was curious if anyone knew of more.

95stang5.0

i know tirerack.com does i am not sure about on an 05 tho.

Daniel60

How big of a tire can you go on that stock rim I like to know. I like to have that tire just a little bit bigger but again will this mess up the speedmeter?

am1scott

Here are 2 sites that have tire size calculators, the second one is best IMO.
http://www.miata.net/garage/tirecalc.html
http://www.1010tires.com/TireSizeCalculator.asp
Also, tirerack.com does have the 2005 in there, you can even choose the color.
http://www.tirerack.com/upgrade_gara...5&autoModClar=
Lastly, according to all tire spec charts I have found, the maximum tire section width for a 7.5 inch rim is 235, in my experience as a tire installer, you can safely (in most cases) add .5 inch, doing that would allow up to a 255. You could run a 255/50/17 (it's 3/4 inch wider than stock) with little worry, they would make your speedo read 60.3mph when you're going 60mph, so not much different.

Hope that helps.

biged3

Thanks for the info. am1scott