Original Mustang tire sizes

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V6 MODEL WHEELS
These are the STOCK original equipment tire sizes for the following years:
1994-1998 - (15" wheels) 205/65-15
1999-2004 - (15" wheels) 205/65-15, (16" wheels) 225/55-16
2005-2007 - (Without Pony Package) 215/65-16, (With Pony Package) 235/55-17

GT MODEL WHEELS
These are the STOCK original equipment tire sizes for the following years:
1994-2004 - (16" wheels) 225/55-16, (17" wheels) 245/45-17
2005-2007 - (17" wheels) 235/55-17, (18" wheels) 235/50-18

COBRA MODEL WHEELS
These are the STOCK original equipment tire sizes for the following years:
1994-1995 - 255/45-17
1996-1998 - 245/45-17
1999/2001 - 245/45-17
2003-2004 - 275/40-17

SPECIALTY MUSTANGS
These are the STOCK original equipment tire sizes for the following years:
1995 Cobra R - 255/45-17
2000 Cobra R - 265/40-18
Bullitt Mustang - 245/45-17
Mach1 - 245/45-17
1999-2004 Saleen - (Front 18x9") 265/35-18, (Rear 18x10") 285/35-18
2007 Shelby GT500 - (Front) 255/45-18, (Rear) 285/40-18

AFTERMARKET WHEELS AND TIRES
Now that I've covered most stock wheel/tire combo's, I'll move on to explain sizing your tires to your aftermarket wheels. Aftermarket wheels generally come in 5 sizes. These sizes are as follows:
17x8"
17x9"
17x10.5"
18x9"
18x10"

The tires you want to fit to each of these sizes are as follows:
17x8" - 245/45-17 or 255/45-17
17x9" - 275/40-17
17x10.5" - 315/35-17
18x9" - 265/40-18 or 275/35-18
18x10" - 295/35-18 or 305/30-18 or 315/30-18