285/75R18 (35X11.5R18) - Too narrow for a 6" lift? - Ford Powerstroke Diesel Forum
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Old 05-08-2011, 06:55 PM
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285/75R18 (35X11.5R18) - Too narrow for a 6" lift?

I just purchased an '06 F250 FX4 that has a 6" lift with 325/60R20s on it. I want to swap to a set of OEM 18s but found that a 12.5" wide tire won't fit on 8" wide rims. Is a 285/75R18 or 35x11.5R18 too narrow to provide stability for a lifted truck?
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Old 05-08-2011, 07:00 PM
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Originally Posted by texas_psd View Post
I just purchased an '06 F250 FX4 that has a 6" lift with 325/60R20s on it. I want to swap to a set of OEM 18s but found that a 12.5" wide tire won't fit on 8" wide rims. Is a 285/75R18 or 35x11.5R18 too narrow to provide stability for a lifted truck?
I personally have 285/75/18 on my 07 and it has a 2.5 inch leveling kit. I think it is ok for a 2.5 inch, but I would NOT run it on a 6 inch. You will be sittin straight up and down, and top heavy. If you had wheels with some negative offset, you might be ok, but not with the stock wheels. I will personally be going with a 9 inch wheel with approx 0 offset and 12.5 inch tire when it comes time for it. I would not do 285/75/18 and stock 18s 6 inches up in the air.
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Old 05-08-2011, 07:02 PM
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You can run a 12.50 inch tire on a factory rim, I've been running 35x12.50s for years on my factory wheels.
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Old 05-08-2011, 07:06 PM
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You can run a 12.50 inch tire on a factory rim, I've been running 35x12.50s for years on my factory wheels.
Ya you can but I think youd be a lot better off with a wider wheel but ya I think itd work. Still though, I think he'd be way top heavy. Those wheels are like a +44 offset.
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Old 05-08-2011, 07:25 PM
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Originally Posted by texas_psd View Post
I just purchased an '06 F250 FX4 that has a 6" lift with 325/60R20s on it. I want to swap to a set of OEM 18s but found that a 12.5" wide tire won't fit on 8" wide rims. Is a 285/75R18 or 35x11.5R18 too narrow to provide stability for a lifted truck?
What does your 20's look like ? Pic ?
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Old 05-10-2011, 04:47 AM
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Mike, pic attached. The wheels are 20x9 Procomp 6001 HDs (4.5 backspace, -12mm offset) with 325/60R20 Terra Grapplers. Handling seems ok, but I tend to take it easy regardless of the vehicle I'm driving (most of my buddies usually refer to Driving Miss Daisy!).

The reason I want 18s is to get more sidewall. I don't really like the look of 20s with 35s. I could go to 37s, but they may rub. It's more of a preference than a need, though.




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Old 05-10-2011, 06:54 AM
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I have 35x12.5R18 (325/65R18) on my truck. Wheels have a -25 offset so they stick out a bit. Cant see 11.5's looking to much smaller. Might look pretty good.


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