37x12.5x18 on 6" of lift - Ford Powerstroke Diesel Forum
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Old 05-29-2010, 10:02 PM
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37x12.5x18 on 6" of lift

My wheels are 18x9.5 with a -12 offset and 4.75" BS.

I currently have a set of 40x13.5x18 tires that are too big to go on my truck . So it seems i have to go smaller . I didn't want to do this but there's no way i can make them work without dumping money into the truck.

Anyways...I'm looking at a set of 37x12.5x18's. With my current wheels, offset, and backspacing will these fit? What do most guys run on a 6" lift around here? What's the biggest i can run without putting too much money into making them work?

Thanks guys


Also what is everyone's thoughts on the Parnelli Jones Dirt Grips? I found a good deal on them.
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Old 05-30-2010, 06:04 AM
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I have a 6 inch lift, and I run 35/12.50/20 on moto metal 955's and they fit very well, i think, from looking at lock to lock that 37's would be VERY close to rubbing, however, with fender eliminators, 37's fit easily! if you do put 37's on, let me know, I wold like to know if they fit lock to lock
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Old 05-30-2010, 06:18 AM
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This is a 4" with 37x12.50 BFG KM2's on 18" XD Series Monster, 4.5" backspacing. There was no trimming needed at all to make these work.
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Old 05-30-2010, 09:39 AM
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Is your truck a leaf or coil spring?
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Old 05-30-2010, 12:27 PM
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That truck is my buddies, its a 2002, and its leaf spring. I have a 4" Rancho kit in my 2008, and I didnt have to trim at all either. I run 37x12.50x20's with 5" backspacing. Clink the link to see a couple pics below.

MobileMe Gallery
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Old 05-30-2010, 03:08 PM
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i have some 38 dirt grips,they are really good i like them alot.work good on road,in sand,pretty good in mud if you can spin them
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Old 05-30-2010, 03:15 PM
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I have 6.5" of lift with 37" km2s and the only rub when i turn into a something with a big ledge, like a curb or something. Other than that they are great.
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Old 05-30-2010, 07:26 PM
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A numerically higher backspacing will push the tire out more or pull it in more?
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Old 05-31-2010, 02:50 AM
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It will pull it in more. But on your truck, you will want a 4.5" backspacing to keep the tires off the leaf springs. We tried my stock 2008 wheel with a 37x12.50 on the 2002 truck, and it rubbed hard on the leaf springs.
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Old 05-31-2010, 10:24 AM
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i don't understand why you would not lift your truck higher to make the forties fit instead of losing money on selling the whole set???? doesn't make sense.
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