Required wheel backspace for 325/60/18's?? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 04-03-2009, 01:52 PM Thread Starter
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Arrow Required wheel backspace for 325/60/18's??

How much backspace will i need to run a 325/60/18 without rubbing on the radius arms? I want to run the least amount of backspace as possible without it rubbing.

I have an 06 f-250.
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post #2 of 13 Old 04-03-2009, 02:52 PM
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i want to say 4.5"

06 F250 4x4 ecsb, lowered 2", 6 Autometer Phantom 2 guages, Accufab Elbow, Zoodad, Airaid , Magnaflow 4"dp, 5" pipe 7" short stack, Studs, Egr delete, sneaky pipe, regulated fuel return, 6.4 banjo bolts, Moderate FICM from Innovative, High idle and foglight mods, Bilsteins, Sulastic shackles, DIY Harley headlights and traction bars. 8.76 in the 1/8th
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post #3 of 13 Old 04-03-2009, 03:49 PM Thread Starter
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wow, really i woulda figured i could do more than that... atleast i was hoping I could...


side note: Does anybody know what the width on the procomp extrem a/t works out to be in a 325/60/18. Their site just lists height. im assuming its 13 ish wide?
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post #4 of 13 Old 04-03-2009, 04:06 PM
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That size tire is the same as a 33x13.50

2005 F-250 CC/SB 4x4 medium wedgewood blue

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post #5 of 13 Old 04-03-2009, 11:43 PM
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Your stock 18's have a 6" back space. The 33's won't rub the radius arms with the 6" back space its when the tire gets taller and wider that they rub like 37's.
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post #6 of 13 Old 04-04-2009, 12:24 PM Thread Starter
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so a 325/60/18 wont rub on my radius arms with any backspacing stock or less then?
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post #7 of 13 Old 04-04-2009, 12:29 PM
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I just put 325/60-18's on my '06 F-250 with a 2" leveling kit. I have 18X10 with -25mm offset giving me, I think 4.5" backspacing and I rub some at the back of the tire. I trimmed a little bit of the valance and used a heat gun to mold the fender well on the rear and am ok, but if I hit a big bump with the wheels turnedjust right it will hit the metal part of the fender.

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post #8 of 13 Old 04-04-2009, 12:31 PM
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If you run an 8 or 9" wheel, you'll probably be ok with a leveling kit. I'm not sure about stock though. Try this for a cheap yet functional leveling kit: eBay Motors: Ford 2005 2008 F250 F350 4WD Leveling Lift kit 2.0 (item 120396712586 end time Apr-23-09 05:54:07 PDT)

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post #9 of 13 Old 04-04-2009, 03:16 PM
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I run 325/60R18 Goodyears on my stock height 07 F-350.....never have rubbed anything.

16,000 miles on stock 18x8s
23,000 miles on Weld Renegades 18x8.5 with 5.14" Back Space.


But, my truck came with the snow plow package and 6000lb coils and I've since swapped them out for 7000lb coils (heavy snow plow ) so I may sit a little taller than some other stock trucks.
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post #10 of 13 Old 12-27-2009, 06:31 AM
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Well I'm soon to be buying some 325/60/18s and some 18x9 XD Badlands with a 4.5" backspacing. I will be running these wit a 2.5" leveling kit.

DO you think I will rub? I have an '03

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