What is the largest recommended tire and rim size on a stock 1967 firebird? Base Model convertible.

What diameter are you planning to run?

Not a lot of room in the front wheel wells for 67/68

I was planning on going with a 16 or 17". I'm looking for a pro-touring look.

I’m a fan of 14 or 15 max. I’ve got 14’s on there now like god intended.

Performance tire sizes in 16s have pretty much dried up over the years . I wouldn't even bother.

A lot of wheels cast wheels offered, don't have the optimal offset (+6 to +8mm) for our cars. You also have to take into account the alignment specs, type of front brakes (discs move the track width out), camber gain, and ride height.

Safe would be 225/50R17 on 17x8s front and 245/45R17 on 17x9 rear if the offset is not less than 0mm. But if you can get the +6 to +8mm offset, you should be able to run 235/45R17 and 255/45R17.

P.S. Don't try to run any tire < 25.5" O.D. It's way too short and looks awkward no matter how low you adjust the ride height - seen it in person.

thanks Mike this is a helpful starting point.

I recently bought a 67 with 18 x 9's (235/40's) on front and 20 x 10's (255/30's) rear.
The fronts rub on full lock and I have to go slow while turning into my driveway or the chrome wheel arch surround get rubbed.
Hope that helps

More information would be required. What offset (or backspacing) do they have? Is the vehicle stock height or lowered? Using a factory frame or aftermarket? Assuming you have disc brakes?

I'm also thinking you're stating the overall width of the wheels not the inside bead to bead. Bead to bead is how wheel and tire manufacturers both define the width. Overall wheel width is about 1" wider. A 235 on an advertised 18x9 (10" overall width) would be very stretched (as would a 255 on an 18x10).

Check your static alignment camber. If it's positive, not only does that play a factor in tire fitment, but handling as well. If you can dial in 1/2 degree negative camber it may help avoid the rubbing and make a huge difference in the handling.

If you were planning to rebuild the suspension, another thing that can help is using Proforged 1/2" taller upper ball joints. This allows the tire to camber in more at the top as the suspension compresses. This is mainly done to improve handling, but a side-benefit would be additional clearance.