Wider Rear Tire On Stock S650

[ohnoauto]

After 22 years I finally own the car I've always wanted. Picked up a 2026 Mustang GT. It has cloth interior, 18" wheels, and might seem bare bones to some but it reminds me of the 1990 Fox body that started the obsession. I have a build in mind but want to do it right. I want to swap the stock exhaust, lower it, keep the stock wheels and offset them just enough to give a more squared off, boxy look. My question...

Stock wheels are 255/45/R18. I want to keep the stock rims but change the rear tires to a little wider. Maybe 265, 275, 285, IDK but I'm wondering if anyone has done this and what was the widest rear tear you could fit with the stock wheels and no rubbing/cutting required? I want to lower the car just a little to more of a street stance so I'm wondering if anyone has any rec's for a lowering kit and wheel spacers to sit the stock wheels flush at the body. If you have any pics of yours please post or send.

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[Dave2013M3]

The OEM wheel is only 8.5" I wouldn't go beyond the 255 tire that is on there. You don't have enough rim width to support the sidewall for a more aggressive tire. Even a 265 tire normally requires a 9" rim width at a minimum, with a 9.5"width for optimum.

 

[GT7 Mayhem]

I've also been doing some research on this since i'm looking to go with wider tires as well. The issue is the stock wheels are only 8.5 inches wide and because of that you can't go any wider with the tires. Unfortunately you will need to get new wheels somewhere around 10 inches wide to go with 285's or something around that range for the tires.

 

[Junkyard Dog]

Go with 11" wheel, 52 offset and 315 to 325 width. Done.

 

[Ken H.]

Tirerack.com shows specs on individual tires in every size. Listed in specs is the rim width needed for each tire. This may help with your decision making.
Also has tire diameter. Try to stay near stock diameter or you may lose your cruise control & pre-collision assist. Been there. Done that.

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