72 Lemans Sport wheel and tire size help

[chaotic73]

Looking to upgrade my wheels to 18x8 with 4.5" BS front with a 245/45/18 tire and 18x9 with 5" BS with a 295/45/18 tire. Suspension is pretty much stock. Does anyone think I'll have any issues with this set up?

This is my current set up, fronts 17x8 with 4.5" BS with 235/45/17. Rears 18x9 with 5" BS with 275/40/18.

[68Formula]

I've heard people run your current 275/40 18x9s rear setup on the front with 6-8mm offset (~5.25 backspace). Have you tried doing a temporary swap to check the fit? Same height as the 245/45R18 and over an inch more rubber. For the rear, since it's 1/2" per side difference from now, measure the clearance and it should give you a pretty good idea.

[chaotic73]

I've heard people run your current 275/40 18x9s rear setup on the front with 6-8mm offset (~5.25 backspace). Have you tried doing a temporary swap to check the fit? Same height as the 245/45R18 and over an inch more rubber. For the rear, since it's 1/2" per side difference from now, measure the clearance and it should give you a pretty good idea.

I didn't think about that, but it's a good idea. Thanks!!

[68Formula]

I didn't think about that, but it's a good idea. Thanks!!

Welcome! If it works out, something to consider would be running the same combo all around so you can rotate tires.

[darguy]

Did you try the rear to front experiment? I’m working out sizes for a ‘68 Beaumont Wagon, same A-Body chassis.

I’m wanting to go with 255/55R18s square, if they’ll fit.

[chaotic73]

Did you try the rear to front experiment? I’m working out sizes for a ‘68 Beaumont Wagon, same A-Body chassis.

I’m wanting to go with 255/55R18s square, if they’ll fit.

No, I didn't. I actually went with a totally different set up. Went with 17x8 in front with 225/50/15 & 17x9 in the rear with 275/50/17.