Wide 315/30R18 vs 315/35R18 Tires for a Ford Mustang New Edge

Thick rear tires on a Ford Mustang New Edge

Installing wide 315/30R18 and 315/35R18 rear tires on a Ford Mustang New Edge can give your vehicle an aggressive look, improved cornering ability, and increased acceleration. With the right setup and modifications, you can make this upgrade to your Mustang without sacrificing ride quality or reliability.

In this article, we’ll discuss the steps needed to install these wider tires on a Ford Mustang New Edge, as well as how they will affect performance. We’ll also provide tips for getting the most out of your new setup. So if you’re looking to upgrade your ride with some wider rubber in the back, read on!

Rear 315/30/18 tires with 1" spacer and fender flares
Rear 315/30/18 tires with 1″ spacer and fender flares. Read the full feature dedicated to this Mustang build here.

These are some of the widest tires you can install and a New Edge, but unless you install fender flares or roll the fenders, they will rub. To ensure a proper fit, suspension modifications are highly recommended.

315/30/18 Tires

If you are a fan of wide tires and looking to get a meaty square setup 315/30/18 tires may be exactly what you’re looking for. They will stick out quite badly, so it will be necessary to install fender flares or modern rocket-bunny style overfenders.

New Edge with Meaty tires

“One of my goals with the widebody kit was to close the gap and chase the wider look without slamming the car. Here, I’m running 11” wide wheels with 1” spacers to close that gap and also fill the gap with 315s lowered about 1.5” using Eibach Sportline Springs”.

315/35/18 Tires

2003 Mach 1 on a set of staggered wheels sized 275/35/18 upfront and massive 315/35/18 on the back
Among all of the New Edge Mustang projects we featured on MuscleCarDNA, the thickest rear tires are installed on this menacing 2004 Mach 1. It sits on set of staggered wheels sized 275/35/18 upfront and massive 315/35/18 on the back. As you see from the pictures, he is not running fender flares, but the rear wheels stick out quite a bit.

Of cource, it wouldn’t be possible to make them drivable without the suspension modificiations. To make such a wide rear tire fit, the owner installed a Bilstein Shocks and Struts with H&R Super Sport Springs, Rear J&M upper control arms, and Maximum Motorsports lower control arms. You can read more about this Mach1 project here.

Conclusion

Installing wide 315/30R18 and 315/35R18 tires on a Ford Mustang New Edge requires suspension modifications to ensure a proper fit. With the right setup and modifications, you can enjoy the look of wider rubber in the back with improved cornering performance, increased acceleration, and no sacrifice to ride quality or reliability. Whether you’re looking for an aggressive look or a meaty square setup, these are some of the widest tires you can install on your New Edge Mustang!

See Also

315/30R18. square tire setup on a track ford Mustang NewEdge 4th gen
315/30R18 square tire setup on a track Ford Mustang New Edge 4th gen. Read more about this project here.

According to the Wheel-Size.com visual calculator the 315/30/18 tires are about 2.75″ wider compared to the factory 245/40/18 tire, while the overall diameter is actually a little bit smaller (646mm vs stock 653mm) which mens that you should expect a slight improvement acceleration, but lower gas mileage due to a larger contact point of wide tires.

he 315/35/18 tires have a larger overall diameter (678mm vs stock 653mm) which will decrease the acceleration and create a speedometer error.

315/30 and 315/35 Tire gallery

Ford Mustang New Edge Rim & Tire Fitment Table

  • Good for: 1999, 2000, 2001, 2002, 2003, 2004;
Tire SizeRim SizeTypeFitmentSee How It Looks
245/45/178x17 ET30SquaredFactoryOEM
245/40/188x18 ET30SquaredFactoryOEM
265/35/18
295/35/18
18×9.5 Front
18×10.5 Rear
StaggeredCustomView on car
265/35/18
305/35/18
18×9.5 Front
18×10.5 Rear
StaggeredCustomView on car
265/35/18
305/35/18
18×9.5 Front
18×10.5 Rear
StaggeredCustomView on car
275/35/18
315/35/18
18×9.5 Front
18×10.5 Rear
StaggeredCustomView on car
275/30/20
345/25/20
20×11 Front
20×14 Rear
StaggeredCustomView on car
225/40/18
245/35/18
18×10.5 All aroundStaggeredCustomView on car
275/35/1818x10SquaredCustomView on car
315/30/1818×11SquaredCustomView on car
315/30/1818×11SquaredCustomView on car
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