'76 and '77 owners, can you fit a 31 x 10.5 on uncut rear quarter?

[reamer]

If yes what is the rim "offset? (distance from back mounting surface of the rim to the outer (inner) lip). I tried the standard 15 x 7.5" rim from the 80's But they are fine on the rear axle, but won't fit on the front axle with the stock configuration of the '76 & '77 disk brake-tie rod connection. rim actually digs into the tie rod....

 

[DirtDonk]

And there in lies the rub (pun intended) of getting enough offset for clearance, but not rubbing the tie rod ends.
Is the wheel in your picture a stock wheel for the bronco, or is it the 80s model you were talking about?
Looks like enough clearance from here, but the wheel also looks pretty beat to crap. So not sure if you can still use them effectively.
If you go to a small tire store instead of a large chain, they will probably mount your 10 1/2 inch wide tire on your stock, 6 inch wide(?) wheel. I would think that would clear the rear.
But I haven’t personally done it.

Speaking of the stock wheels… When you have one off, please take a back space measurement, and double check the overall width for us. Please.

 

[reamer]

The "max" allowable backspace (with stock 1977 Ford Knuckles) is 3 3/8" Measured from where the rim mounts to the axle to the plane of the rim lip. SOOOO if there is minimum inner offset, the tires will stick out and rub the rear un-cut quarters?. I tried to put a stock '80's Ford 15 x 7.5" aluminum rim on it, the rear rolls fine, but the front digs into the tie rod. What was Ford thinking forging the knuckles with the tie rod mount curling in towards the rim? Yet on a 78 The mount is straight? And if I swap to '78 knuckles, the Inverted "Y" drag link has No adjustment for the shorter length between knuckle and PS box....

 

[DirtDonk]

Ford was angling the steering arms outward on the short wheelbase Bronco to try to get better Ackerman angle, and therefore better steering and Road feel.
This is not needed on the 7879 full-size vehicles because they were much longer wheelbase and wider track.
They were simply trying to make the 76 and 77 Broncos a little more roadworthy.
Larger wheels, and tires never came into the equation.

 

[DirtDonk]

At least that was my take on it.

 

[Tricky Dick]

I tried to put a stock '80's Ford 15 x 7.5" aluminum rim on it, the rear rolls fine, but the front digs into the tie rod.

By how much? Would some 1/4" slip on spacers give you what you need?

 

[reamer]

good thought, if I can get longer wheel studs, that may work...

 

[Madgyver]

30x9.5 here om stock wheels

 

[MThalfcab]

Sure like your half cab