Wheel/Tire offset question-18X10's, '06 F350 - Ford Powerstroke Diesel Forum
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Old 09-14-2013, 04:37 PM
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Wheel/Tire offset question-18X10's, '06 F350

I'm looking at beefing up the contact patch of my '06 F350 SRW for carrying a slide-in camper and towing. Im toasting 60k tires in 30k. Currently I have the 18's with 275/70/18's. I believe the stock wheel is 8" wide. I want to go to 10" wide wheels to put 325/60/18's on, so the tire will be the same height(looking at the Goodyear Silent Armor's). I have a stock FX4 package truck, but am about to upgrade the front end to the camper package springs (5600 vs 5200 and I think a little taller.) Im finding most of the 18x10's have a -24mm offset, whereas Im seeing that the preferred offset would be more like +10mm to +20mm. Anybody tire/wheel gurus out there have any comments or suggestions on clearance issues, if any? Of coarse I could just buy a dually.....And yes, Ive been searching and reading the forums, my eyes glaze over trying to figure out this math.
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Old 09-14-2013, 05:31 PM
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You are going to want to stay close to 6" of backspacing for clearance. So for 10" wide wheel you should find a wheel with between 0 and +12 offset


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Old 09-14-2013, 05:50 PM
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Perfect, Thank you! Now to find a wheel that matches the description.....

Last edited by doclouns; 09-14-2013 at 05:57 PM.
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Old 09-14-2013, 06:42 PM
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If I go by the chart, a 4.5 backspace with a -24mm offset is acceptable. What is the difference from 6/+10?
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Old 09-14-2013, 08:13 PM
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Quote:
Originally Posted by doclouns View Post
If I go by the chart, a 4.5 backspace with a -24mm offset is acceptable. What is the difference from 6/+10?
You need to stay close to 6" of back spacing for the tires to clear the fenders. You go with 10" wide on -24 offset the outside face of the rim is out 4" further out then stock!
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Old 09-14-2013, 08:30 PM
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oooooh, with the FX4 and the addl lift in the front, that an issue?
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Old 09-14-2013, 08:42 PM
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Just for reference, this is how far they would stick out with 18x10" rims with -24mm offset and 325mm wide tires:



If I went with 18x9" wheels then I could get the correct offset, but the 18x10" wheels only came in -24mm offset.

Last edited by GregsSD; 09-14-2013 at 08:47 PM.
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Old 09-14-2013, 09:26 PM
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and thats a 5" lift?
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Old 09-15-2013, 12:34 AM
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Originally Posted by BIG Laing View Post
and thats a 5" lift?
Yes, 5" Procomp lift in the front (before they switched to the 6" kits)

and 5" Donahoe Racing springs in the rear with no blocks.
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Old 09-15-2013, 07:28 AM
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So far, all I can find...

Rbp Diesel Performance Part 94R-1810-87-12BP - 94R Series - Black Alloy Wheel
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