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12-17-2019, 02:20 PM | #1 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,031
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Re: Back spacing
Quote:
Typical trucks w/a 4/6 drop & factory 6-lug pattern can run 4x4 15" truck Ralley wheels in back w/o issue. They have 4" back-spacing. There might be a little wiggle room going out-board but not much. Using that as a starting point helps do the math quickly.... 8" wheel w/4" back spacing fits no-problem. 9" wheel would need 5"BS to fit no problem. 10" = 6"BS 11" = 7"BS 12" = 8"BS Given those numbers for a 'no-problem' fit to the outside sheet metal, you can WAG how much wiggle room you have before it requires a different number/combo to work (ex: 12" wide w/6"BS is going to stick way outside the body & will require narrowing the rear end or flaring the wheel opening; 12" wide w/7-7.5"BS might work but would be close).
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