Ok, it is a tease, so explain how changing the belly height will affect the tire size you run or vice versa. I’m at a loss on that one...Up until now I've treated my build like a Lego project. Building a little here and there, and when something broke I upgraded it. Not that there's anything innately wrong with that building style but I wanted more and the building bug has bitten me HARD. After talking with Blaine I started to have a deeper understanding of the complications that one component can have on another. I couldn't just slowly build what I had into what I wanted I had to jump ship and swim into the uncomfortable.
I listed parts for sale from my previous build that I wouldn't need and continued to refine the details and specs of my build.
Blaine had me pick a few specs to build to:
- Tire size that I won't change from.
- Belly height.
All of these effect each other. Change one and you must change another.
I decided on a balance for travel and clearance.
Ok, it is a tease, so explain how changing the belly height will affect the tire size you run or vice versa. I’m at a loss on that one...
Why are 37s better?
I'd guess uptravel and the extra 1.5" of bumpstop you need, all else being equal. I'm sure that can be overcome.
My other theory would be that it effectively shortens the wheelbase...if you need 37's to make the LJ act like the shorter wheelbase TJ on 35's, its stands to reason that 40's would keep "shortening" the wheelbase to the point where climbs would become tough...greater chance of roll over.
Ok. First of all, curious what's best for rock crawling? I mean, what is the main thing I need to do to my Jeep to maximize crawl benefits (and stay on 33's)? I have a build plan and I feel like I've put my parts together carefully. But that's being challenged in my thinking.Firstly, you need to ask yourself what you are building for: mall crawling, hill killing, mudding, rock crawling — the only wrong answer is the one where you lie to yourself. If you are building for strictly hill climbing the longest wheelbase you can shove under your Jeep is probably a fairly good idea. For desert racing the most travel you can fit in is a good idea. I'm chasing ideals for crawling with a touch of Ultra4 inspiration thrown in, which is based on a proven observed ratio of what works.
A TJ is ideal for what I am building for on 35s and a 100" wheelbase, this results in a breakover angle (determined by belly height of Y) of X.
An LJ takes a bit more to be able to run the same trails as that TJ. To have the same breakover angle of X in an LJ you must run 37" tires. But now if you are running the same belly skid as you are on the TJ your belly height increased by 1" due to the larger tires resulting in a belly height of Y+1". Because you put on bigger tires you effectively reduced your wheelbase. You can't choose a belly height without choosing a tire size, and you can't choose a tire size without choosing a wheelbase — and those all effect what you need of the other.
Again, this is based on ideals and what is proven to work good.
Bonus homework: After I was asked what tire size, wheelbase, and belly height I wanted it took me about a week to figure out the ratio concept and another week to understand what I wanted. I was caught up on why 37s were better than 40s. The cost of running one or the other is nearly identical, but once you build for one, you need to nearly redo the entire build to switch. Why are 37s better?
Ok. First of all, curious what's best for rock crawling?
I mean, what is the main thing I need to do to my Jeep to maximize crawl benefits (and stay on 33's)? I have a build plan and I feel like I've put my parts together carefully. But that's being challenged in my thinking.
Second, so you put bigger tires on, which effectively reduces your wheelbase. Why can't you extend your lower arms to increase the wheelbase back to where you want it? Or if you do that, are you losing the belly height you were wanting to achieve for that breakover angle?