I’m about to buy a new set of tires for my 2004 Mustang GT 40th Anniversary. I Need some help picking a tire size that looks good and performs well. Right now I have the stock tire size 245/45/17 on stock Bullit wheels.
 

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Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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If you have stock wheels, then the stock 245/45/17 size is probably the most ideal to run.

If you want a little bit more meat, then 255/45/17 would be good and is what Ford put on the 94-95 Cobra with 17x8 wheels. It will put your speedo off a tad as it's a 26.0" OD tire vs the stock 25.7".

You really shouldn't put a 275/40/18 on an 8" wide wheel, although it's been done. You'll have some excessive sidewall bulge which looks great but can be detrimental to handling performance.
 
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