05 Mustang

there's nothing wrong at all going with 45's. they may offer a better ride than the 40's, but I personally don't think it'll be that much?

overall diameters per rim/tire size

255/45/18 - 26.97

275/40/18 - 26.61
275/45/18 - 27.74

whtcanbrwnd04u

Ive heard that the car starts acting weird above 100mph with anything higher than 40 series?

VistaGT

The GT500 has 18X9.5 rims. Also they run staggered from the factory with 285's out back.

As far as another post I'm thinking of going 18X9's all around too (so i can rotate as well ) and I think I'll go with 275's. Why would I put rubber that I could fit on the stock rims?? THat's one of the reasons for new rims haha

abrush

I am currently running 18x9's all around and run 275/45/18's. The ride seems pretty smooth and they seem to work well. No complaints here.

05 Mustang

I've never heard that one before, hopefully someone with a similar set-up will chime in and let us know...

howarmat

285/40 will work all the way around with proper offset

VistaGT

Isn't 285 up front a bit much rubber? I know that they use 275's up front on alot of cars but isn't there a downside of too wide a front tire. I forget the effect on handling but something happens whether the car plows, understeers w/e lol

UrS4

Where can I get a 275/45/18 tire that isn't a SUV sport tire?

5SPD07GT

thanks, i'll look into some prices. any recommendations?

AmericanSpeed

Is your mustang lowered at all? If you are at stock ride height, I wouldn't recommend running a shorter diameter wheel/tire combo, stock height already has a lot of fender gap. You don't want to make it worse.