15x12 on 3/4 ton

[SCOTI]

Originally Posted by BurbFam

Hello all, new member here. I remember seeing a wheel/rim fitment thread on here, or maybe another site? Either way, I’ve recently picked up a 1991 3/4 ton suburban 4x4. It’s got i believe 3” fender flares but stock wheels. Looks dumb how sunken the wheels look. I found some 15x12s with 3” of backspacing, according to the seller for $80. 1) how far will these tires stick out and 2) is that enough backspacing to clear the calipers? Thanks all and look forward to get to know you guys and help as much as i can!
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15x8" 6-lug truck ralleys are common for 4x4's. They have 4" of back spacing & clear calipers so the 3" will clear.

The 12" width & 3"BS will extend about 5" from the edge of the fender lip. More than likely that is beyond most common flares. You can determine the 'will they work' on your own. Pull a wheel & verify the back spacing. Hang a plumb bob off the flare & measure the current distance from it to the current wheel/tire combo. Then it's simple math for your answer.

[BurbFam]

Originally Posted by SCOTI

15x8" 6-lug truck ralleys are common for 4x4's. They have 4" of back spacing & clear calipers so the 3" will clear.

The 12" width & 3"BS will extend about 5" from the edge of the fender lip. More than likely that is beyond most common flares. You can determine the 'will they work' on your own. Pull a wheel & verify the back spacing. Hang a plumb bob off the flare & measure the current distance from it to the current wheel/tire combo. Then it's simple math for your answer.

Mine is 3/4 Ton so it’s 8 lug. 3/4 Ton calipers are bigger than halfton right?
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[SCOTI]

Originally Posted by BurbFam

Mine is 3/4 Ton so it’s 8 lug. 3/4 Ton calipers are bigger than halfton right?
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Whoops.... Overlooked the 3/4 ton 8-lug portion. I would bet 16's are needed as well.