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Old 08-25-2018, 12:01 PM   #1 (permalink)
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Minimum Vehicle Width for 40" Tires

I have 35s on my LJ and want to upgrade, and have hit the classic battle that by the time you invest in axles necessary to support 37s, you might as well go with 40s! My concern is the vehicle width needed for 40s.

How wide do I really need to be in order to have reasonable turning abilities? I'm not building a mall crawler. I want functional, not just big. I have a 4 post lift that's only 80" wide, so that's my max width. Also in the PNW we have lots of tight trails, some with width filters in the area of 80, some less.

I'm happy with width from outside tire to outside tire, or your successful WMS-WMS, backspace, & tires and I can do that math. Thanks!

I welcome answers to the same question for 37s or 38s, in case I have to abandon 40s due to this problem.
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Old 08-25-2018, 01:10 PM   #2 (permalink)
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Most of my friends with 4dees are in the 68-70 wms area. Fullwidth.

65 for 37s (jk ish width)

Probably ought to go 72 with 42s.
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Old 08-25-2018, 03:00 PM   #3 (permalink)
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Originally Posted by Beat95YJ View Post
Most of my friends with 4dees are in the 68-70 wms area. Fullwidth.

65 for 37s (jk ish width)
Yeah, I know many people run full width because it's easier/cheaper and more stable. Win win. But in my case, if I run full width Ford D60s, I would be exactly at my max if I run super high backspace H2 wheels and 40x13.5" tires. What I'm trying to decide if whether that is necessary because I also hear using H2 wheels puts your hubs at pretty high risk of being hit. I assume not because Currie's 60 VXR is 64" WMS-WMS.

Too thin and you can't turn worth a crap. The question I'm looking to answer it, at what point do you get good steering and increasing width more mostly only adds to more stability.
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Old 08-25-2018, 03:26 PM   #4 (permalink)
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The guys with 70 axles are running Currie/Dynatrac axles to get full steering. Some are jk, so thats why I think you can skate at 68.
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Old 08-25-2018, 03:31 PM   #5 (permalink)
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My cj7 I bought 64 axles hoping to run 40s. Unfortunately that project was parted out. The guy that bought the axles slammed them in a cj6 on 40s, but it isnt running. As the cj frame is narrower than tj, i would think you would want to be wider.

Im currently building a jk width LJ to run 37s hopefully to get more steering and keep the tires out of the frame.
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