38/15.50/18's with 8.5" lift What backspacing? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 07-08-2011, 08:30 PM Thread Starter
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38/15.50/18's with 8.5" lift What backspacing?

Im putting my lift package together and need a little help with wheels. Truck is a 04 f250, I'm buying a 8.5" lift and 38/15.50/18's. What backspacing will I need? most of the wheels I found are 18x9 and backspacing is available from 4.5" to 5.75". Will a -12mm offset/4.5" backspace work? Thanks in advance
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post #2 of 7 Old 07-08-2011, 08:36 PM
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Yes, a 4.5 backspace with that offset will work. Will stick out a little farther than stock.



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post #3 of 7 Old 07-08-2011, 08:53 PM
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I would think you need a wider wheel for a 15.50 wide tire. I know my toyos a 12" wheel is recommended.. im sure an 18 a minimum you would want is a 10" wide wheel

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post #4 of 7 Old 07-08-2011, 08:54 PM
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Yes, a 9" wheel for a 15.5" tire will not be optimal. I'd get AT LEAST a 10, preferably a 12" wide wheel.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

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12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks

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Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter

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2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth

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Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db
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post #5 of 7 Old 07-09-2011, 05:15 AM Thread Starter
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Ok, I guess I'll be going with a 18x10. Will a 18x10 -24 offset work? I cant find the backspacing specs listed anywhere but if I calculate it right it would only be 4.0" Will I need more the 4.0" of backspacing? Wheels I want are Moto metal 961's
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post #6 of 7 Old 07-11-2011, 10:49 AM Thread Starter
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Ok, I found out what the true backspacing on the wheels are, its 4.5". Will these work? Again they are 18x10 -24 offset and I'm running 38x15.50x18's on a 8.5" lift. Getting ready to pull the trigger on the wheels but want to be sure they will work. Thanks
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post #7 of 7 Old 07-11-2011, 11:32 AM
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4.5" is what a OBS or 99-04 requires min, less is ok, more will rub the springs. But with 15.5 wide they will still rub the springs..
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