Is anyone running 10” wide wheels on all four corners

10" will work on the front with the right parts and the willingness to roll and push your fenders a bit.

It has been done too, on a Valiant at that. Member tomswheels ran his Valiant with 18x10's on the front with 285/35/18's. His car was a long way from stock of course, but he still ran torsion bars up front. In fact he ran 73+ disk spindles with Hotchkis UCA's. The fenders were rolled and pushed pretty substantially, but no dirt car cut fenders up front. He actually did a lot more work in the rear of the car for tire clearance than he had to do in the front.

Wide Fronts on a 68 Dart

Appropriate Wheel Offset for 18" Wheels?

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I run 275/35/18's on my Duster with 18x9's, but there's no reason I couldn't run them on 18x9.5's or even 18x10's for that matter. I did roll the fender lips and have applied some "push" to the fender when I did the rolling, but again the bodywork remains pretty much intact. There are things you can find if you look, like the lengthened fender to bumper support rods, but it doesn't require dirt car cutting.

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And my Duster has been my daily driver for years now. I run a 16:1 fast ratio manual steering box with a Tuff wheel to boot, so those saying you can't steer it are full of crap. It requires modern alignment specs for sure with additional positive caster to counter the rut seeking/following behavior that the wide front tires will give you, but it is not at all insurmountable.