2003 King Ranch F250 6.0 4X4 wheel fit
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From: Houston, Texas
Those appear to be the 2005-2010 King Ranch 18 inch rims. You will need 2 inch spacers for them to bolt up correctly. They will bolt up, but they'll be under your fenders by about tow inches.
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5th Gear
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From: North Carolina
Work for towing?
Is it recommended not to use these if I plan in towing a gooseneck horse trailer?
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Joined: Sep 2003
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From: Houston, Texas
Originally Posted by Rancher03
Is it recommended not to use these if I plan in towing a gooseneck horse trailer?
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General rule of thumb is that spacers reduce your payload and axle GWRs, because you're creating a longer moment arm than what the bearings were designed and spec'd for. There's always a moment arm, but adding 2" to it drastically increases it, and to stay in the bearing's ratings you can only lower the weight allowed.
If it's a fairly light tongue weight, though, you would probably be fine.
Ideally, though, you'd want to get rims with the proper offset.
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5th Gear
Joined: May 2026
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From: North Carolina
I would hesitate to use spacers, especially 2" ones, depending on the tongue weight of said gooseneck.
General rule of thumb is that spacers reduce your payload and axle GWRs, because you're creating a longer moment arm than what the bearings were designed and spec'd for. There's always a moment arm, but adding 2" to it drastically increases it, and to stay in the bearing's ratings you can only lower the weight allowed.
If it's a fairly light tongue weight, though, you would probably be fine.
Ideally, though, you'd want to get rims with the proper offset.
General rule of thumb is that spacers reduce your payload and axle GWRs, because you're creating a longer moment arm than what the bearings were designed and spec'd for. There's always a moment arm, but adding 2" to it drastically increases it, and to stay in the bearing's ratings you can only lower the weight allowed.
If it's a fairly light tongue weight, though, you would probably be fine.
Ideally, though, you'd want to get rims with the proper offset.
Here are the wheel part numbers with offset info
3C34‑1007‑EA 1999–2004 Super Duty (earlier body style) ≈ +10 to +14 mm (lower positive offset)
5C34‑1007‑NC 2005–2010 Super Duty +40 mm
Is roughly a ~25–30 mm difference, which is about 1"–1.25" further outward per wheel on the older-style rim.
With such a small difference, if I stay with the same width of tire as currently on it, 10.4" there seems to be plenty of room to use the 18's. I'm running 265/75/16's now. Looking to run 265/70/18.
Last edited by Rancher03; May 21, 2026 at 11:10 AM.
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