[bigjim52]

I own a stock 1967 lemans, what is the biggest tire wheel size and could put on without altering the body?

[The Champ]

With the correct BS and tire selection, you could run 20" wheels and tires. I'm not saying you want to, but it can be done. The car came with 14's and skinny tires about 27" tall.

So theoretically, you could stuff a 235/30/20 under the front and 255/30/20 rear with proper BS. They will be much shorter than 27", but they should fit.

I've run 235/60/15 on the front and 255/60/15 on the rear - just as wide as those above, just taller, much closer to the original 27" diameter.

[JLMounce]

You definitely need to measure on the early A-body cars. a 4 wheel drum equipped car will take a 0 offset "off the shelf" wheel a little easier. If you have disc brakes, the hub to hub distance extends about 1.5" total and it's unlikely you can get a 0 offset wheel in large sizes up front without rubbing.

Get your straight edges and tape measure out. You need to determine how much width you have in the wheel houses, where the mounting surfaces are in relationship to the center of the wheel house as well as how tall the wheel house is in relation to the center of the hub. These dimensions inform your wheel and tire sizing as well as the offset needed on the wheel.

The early A-body cars under stock wheel houses and sheet metal will never be able to hold a wide tire, especially in front. Going to a shorter 26" tall wheel and tire combo does seem to help you gain a slight amount of width as well.

[Stuart]

You need to define what you mean by large - are you talking width, diameter, overall height?