best offset and back spacing for 37s? - Ford Powerstroke Diesel Forum
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Old 05-02-2012, 08:33 PM
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best offset and back spacing for 37s?

Im about to upgrade from 35s to 37s I know I have the minimum lift for it so I wonder what you all have found is the best offset and backspacing to clear as much as possible. Pro comp tells me -6 on 4.5 back spacing 17x9, but I have also heard anywhere from 0 to -24 I Currently have Eagle alloys with I think -24 back spacing 10 inch wheel and it caused the tire to articulate a lot and will make the 37 real close to the fender liner. Any advice is appricated.
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Old 05-03-2012, 11:35 AM
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Anyone? Im starting to wonder if my questons I post are too stupid for respnces or too hard. Im also wondering if you think I should have the tire ballanced with weights or the bags that go inside.
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Old 05-04-2012, 05:56 AM
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Sounds like you have a big decision. I would also take into consideration the tire width and tread depth. I have a 2005 F-250, same color as yours, with a 4" lift on rear and a 6" lift on front. But I placed 35x13.50.18's (or 325/65/18) on mine. I have 3/4" space when I turn my tires before I hit the front bumper. I had an 1" space before I put different tires on. I had the Pro Comp Xtreme A/T's and placed the Cooper STT's under it a few months ago. Much needed traction for places I take it. But have to be more careful not to hit holes too hard with wheels turned to not hit front bumper. If I had 12.50's, it wouldn't be such a problem. Ask your tire dealer if they believe it will clear, if you do decide to go to a larger tire. It's best to bring to a off-road dealer and get their input.
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Old 05-04-2012, 06:33 PM
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Thanks For the help, I think Im going to go with just -6 offset, on 9 inch wide wheels, did you use wheel weights or the bags in the tires for balancing?
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Old 05-06-2012, 02:50 PM
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I have a 4.5" lift on my '11 and put 37" Toyo MT's on an 18x9 wheel, with 5.75" backspace and a +18 offset. The setup turned out well for me although I'm not sure what type of look you are going for. My tires stick out past the fenders about 1" to an 1.5", and no worry of making contact with the bumper or liner. Slight rub at full lock left, but I think that is more of an alignment issue. Hope this helps.
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Old 05-06-2012, 06:46 PM
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That does help, thanks
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Old 05-09-2012, 08:12 AM
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Quote:
Originally Posted by Ray Bennett View Post
That does help, thanks
Do you have leaf springs up front? This could also pose an issue when replacing tires. I am running a rim with 35" mud countrys and they rub the leafs with a +18 offset at full wheel lock. I am going to switch to a -12 rim and was wondering if a 37" tire will rub myself.
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Old 05-09-2012, 12:11 PM
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Quote:
Originally Posted by mechanix View Post
Do you have leaf springs up front? This could also pose an issue when replacing tires. I am running a rim with 35" mud countrys and they rub the leafs with a +18 offset at full wheel lock. I am going to switch to a -12 rim and was wondering if a 37" tire will rub myself.
This I can help ya with, I do have the front leafs, and you are running the wrong wheels, That kind of offset is for the 05s and up, on our trucks we need 0 or negative offset. I am currently running -16 offset with 35s and dont get near the leaf springs, The only problem with moving the tires out wider is the further out they go the closer they get to hitting the fender well near the door because they articulate more when you move them out. I think I will go with either 0 offset or maybe -6 i need less articulation with the taller tires. But back to your question, as long as you are between 0 and somthing negative you will not rub with 35s
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