Tire size help

[JP8]

I’m in need of some advice on a wheel and tire combo for a 1973 Barracuda.

Keystone Classics. 15x7 front with 3.75” BS, 15x8 rear with 3.88” BS.

Not ideal backspace but it’s Keystones have on offset/backspace per wheel size so we’re stuck with what they give us.

I would like to run a 235/60 front and 275/60 rear. Anyone have wheels in those backspacing? What is the general consensus?

 

[JP8]

 

[moparleo]

Perfect match up..

 

[JP8]

 

[Xcudame]

Definitely no problem on the front. And shouldn't be an issue on the rear either. Just take a measurement on both sides of the distance between the wheel mounting surface (hub) and leaf springs. Usually they very close, but I've seen them a half inch different sometimes! Quality control wasn't very good back then unfortunately. Would suck to have one tire clear the leaf springs and one rub or close to rubbing!

 

[Spyder]

I'm not sure what my backspacing is but I've got 275 60R15 on the rear and 235s on the front. I love the look but I'm going to go down to 255s in the rear when I put new tires on it this spring. A little shorter tire should help performance out with my setup. The 275's fit fine but the passenger side is too close to the fender for comfort. Probably not a problem, but when I run my hand between tire and inner fender it's a squeeze and it makes me uncomfortable.

 

[JP8]

Definitely no problem on the front. And shouldn't be an issue on the rear either. Just take a measurement on both sides of the distance between the wheel mounting surface (hub) and leaf springs. Usually they very close, but I've seen them a half inch different sometimes! Quality control wasn't very good back then unfortunately. Would suck to have one tire clear the leaf springs and one rub or close to rubbing!

I was more worried about the wheel lip than the leaf spring. I’m not real familiar with e-body wheel fitments. I’m an A-body guy and have 15x8 rallyes with 255’s and 4.5” BS.
These Keystone wheels are close to 0 offset. I hear e-bodies like that.
If they rub a little on the rear we can always put longer wheel studs on and run the appropriate billet spacer.

 

[JP8]

Actually, I’m going to decide on a 255 rear after consideration of the camshaft (~230 @.050) and rear gear (3.23). It already needs more gear and adding a taller 275/60 won’t help.