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‘67 GTX, P275-60-15s, will they fit poll.

Will they fit? Select one of the following:

  • Yes, they’ll fit just fine

  • Yes, but might rub under specific conditions

  • Yes, but will rub frequently

  • No way in heck will they fit

Results are only viewable after voting.
BSB67

BSB67

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I’m going to try and fit P275-60r 15 BFG TAs on my 67 GTX in the next couple of days. I don’t know if they’ll fit, but I think maybe.

In your response, presume I have the perfect, or nearly perfect offset/back spacing. That’s the goal anyways.
 
7 or 8" wheel?

I had 255/60 - 15s with 8" wheels on my 66 Satellite, new springs and bushings but backing up onto my front lawn (a fairly good short slope)
the wheel lip molding cut the sidewall. My driveway had washed out several times and cut a trench on that same side.
Used to be ok, until it wasn't.
In a 60 the 255 is large as you can go but there is a risk.
I backed off to 245/60 coopers last spring, doesn't look quite as muscular, but then neither do I anymore.
 
I have them on a car at stock ride height, not raised up like SS Springs will do. They don't fit fine at all without working the problem.

The outer wheelhouse needs to be pushed out because they will rub there before the lip.

And the wheels need to be the perfect offset. On my car the left side tire rubs the outer more than the right. I had steel wheels made to my specs, different offset each side.

It's really not worth it since a Radial TA has zilch for traction anyway. It like driving on wet pavement. Use a 255/60/15

My 775x14 reproduction redline tires from the 80's have more traction than any TA
I've tried. And I'm not kidding.
 
On my 67 Hemi GTX I had a couple of tricks:

1) Jack the car up high enough o put the bottlom of tire wayback under the brake
drum and slide to top over the drum.

When that did not work:

2) Jack the car higher still and remove the springs from the back shackle and let the entire
rear end drop as far as possible and then install tires.

As I recall back then I had a 7 Inch Centerline with a 4 7/8 Back spacing. I will take them off
the shelf and measure them when I get a chance (They are still there 55 years later).

When the 275s still do not fit = buy smaller tires!

Then buy a car trailer in case you get a flat tire when you are not in the shop!



My .02 = For Free
 
Jack up one side at a time to tilt the rear axle. If you lift both off the ground at once the tire won't go between the 10" drum and Quarter panel.
 
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I have 275/60x15 on the back of my 65 coronet using an 8" wheel with 4.5" back space. My coronet has a similar slab sided quarter panel and narrow wheel well. Safe clearance with stock ride height. I wouldn't try anything different.

20260114_092915.jpg


20260114_092837.jpg
 
On my wagon, I have 255/70-15's on 15x7 cop wheels. To get them out, I deflate the tire and wiggle it out. When it had the 10" drums, it was easier. Have 11's now so it's more of a challenge. 235/70-15 up front.

IMG_8486.jpeg
 
What was your back spacing on both the 7" and 8", and where did it rub?

The few wheels I looked at, the 7" usually has an offset that better centers the tire in the wheel well, and the 8" wheels seem to add most of the additional 1" to the outside of the rim (i.e. same back spacing as the 7") , shifting the offset 1/2" to the outside.
 
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R413 said:
I have them on a car at stock ride height, not raised up like SS Springs will do. They don't fit fine at all without working the problem.

The outer wheelhouse needs to be pushed out because they will rub there before the lip.

And the wheels need to be the perfect offset. On my car the left side tire rubs the outer more than the right. I had steel wheels made to my specs, different offset each side.

It's really not worth it since a Radial TA has zilch for traction anyway. It like driving on wet pavement. Use a 255/60/15

My 775x14 reproduction redline tires from the 80's have more traction than any TA
I've tried. And I'm not kidding.
Click to expand...
The TAs I had on my 67 Belvedere were flat out scary if it rained the slightest amount.
 
I have 245/60-14's on mine. I still have to jack the car up a little to get them in. 275's would be a real struggle.


20230115_174358.jpg
 
If you're aiming for perfect, get the rim estimator tool, cave in the outer tub and trim the wheel lips. Make sure the front lips won't touch.
 
The wheels came last evening. Mounted them without the tires. They center pretty well. I’ll have my local guy mount the 275s if he has them and has time. He’s good with me doing a trial.

I won’t be cutting or massaging anything. If they don’t fit they’ll go back.

If they fit, then the tougher decision.
 
I hated the effort of mounting wider tires than stock with 15” wheels and 11” drums. Even 235/70-15s were a struggle with entire the rear jacked up and hanging free. Having later, wider 68 up axle units under both of them was probably most of the issue. What were the odds both of my cars had later axle units under them? Before going with such wide tires it’s a good idea to verify you still have a 66/67 axle housing in the car.
 
With 66/67 wheel arches, taller is also an issue.

I had a heck of a time even getting 205/75/15 up in there.

Needed full spring extension, and even had to wiggle after that.

There IS a pronounced bump out in the upper, outer wheel well that severely interferes with a wider tire if the rear end doesn't sit high enough.
I believe it is more of a structural roof/C pillar support issue (careful, lots of stuff welded together there).
 
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