Discovery S/T Maxx 255/85r16, and Concentric Dually Spacers

79GLIDE

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I'm going to guess that Centurion used an aftermarket dually wheel, rather than the Ford factory wheel. I'll measure both and report back for future reference.
 

79GLIDE

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Mine has steel bud type dually wheels with Pacific Dually chrome simulators.
 

Pork_Chop50

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Factory 4x4 dually wheels have the most back spacing over the 2wd or Alcoa

And keep in mind there were no factory 4x4 dually's until 1999. Again from what I gleaned, and this is not written in stone, the 5.15" backspacing typically was designed for a 215 width. The 5.35"(steel) or 5.40"(aluminum) would be on a wheel for a 235 width which would have been sold with "traction tires" during that era according to some sales literature.
 

79GLIDE

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Exactly. Prior to the factory 4X4 F350 dually, Centurion beat Ford to the punch by taking the SRW F350 4X4 by hacking off the box sides around the fender wells, adding fiberglass dually fenders, spacers on the both front and rear axle hubs, and on my '87, steel bud type dually wheels for spec 215's. I purchased an '88 F350 dually specifically for the purpose of swapping out the SRW rear axle for a proper DRW axle. I've got 7 255's mounted to the wheels, but the sidewalls touch. I'm determined to find a solution to make these tires work on this truck.
 

Pork_Chop50

He looks kinda hairy and slobbery to me....
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Southwest wheel company is a great resource but I would personally talk to neighborhood tire shops and look for dually take offs. Junkyards are great also, we located a complete set of Mopar 17 inch dually steels that way. Happy hunting
 

chillman88

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And keep in mind there were no factory 4x4 dually's until 1999. Again from what I gleaned, and this is not written in stone, the 5.15" backspacing typically was designed for a 215 width. The 5.35"(steel) or 5.40"(aluminum) would be on a wheel for a 235 width which would have been sold with "traction tires" during that era according to some sales literature.

This is "partially" true. Cab and chassis trucks could be ordered 4x4 dually IIRC, and they would have 235's, but the 4x4 dually PICKUP was not factory.
 

79jasper

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Lol I think dieselcrawler is well versed in the subject.
Not exactly a noob.

And sure, they didn't roll off the assembly line as a dually. But people try to act like they don't even exist at all.

Sent from my SM-G892A using Tapatalk
 

79GLIDE

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Dually F350 4X4's didn't exist from Ford as a production light truck in 1987. I've been buying Ford trucks since 1981. So, If I want to get take-off OE dually 4X4 wheels, I'll have to try later model Ford dually 4X4 wheels with a deeper offset, as our friend Dieselcrawler suggested, or other make wheels with a deeper offset. Or, use a spacer, which was the point of this thread to begin with.
 

snicklas

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Ford made a 4x4 dually in the 83-97 trucks.

What they did not make was a 4x4 Crew Cab Dually with a pickup box factory. @79jasper has an OBS 4x4 dually from the factory, but it’s not a crew cab.

Also, you can not use the wheels from a 99+ 4x4 or 2wd dually. 97 down trucks have 8x6.5” lug spacing. 99+ have 8x170mm lug spacing.

Corey @Dieselcrawler is correct on the dually rim information. Find a 97 down 4x4 dually and snag the rims.
 

Dieselcrawler

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Today when I get home I will set the 2wd wheel from my 94 f350, next to the 4wd wheel from a factory 90 f350 c/c truck. Will take a photo and measure the difference. Iirc it is close to 3/8 different in height.
 

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