Breakover angle

[bairdy380]

G'day all,
Just checking if anyone else has looked at the breakover and potential improvements. I ask, as I see a lot of DC utes get hung up over here and damage rigs.
The stock 20.4 is woeful, but my rough calcs of a 2" lift + 35's after settling would achieve around 24.
This only brings it back to existing stock current model market offerings. Has anyone else looked at this or re-confirmed possible figures?
I am going to do a physical check on my current vehicle as I know it's capability and could then make a sound judgement.
Cheers
Pete

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[camodog]

Unfortunately I do not know how to calculate the correct breakover angle,and was wondering last night what it would be with 37’s and a 2” lift?
37’s in theory should give the truck a 2” ground clearance lift over the stock 285/70 (33ish”)
And the 2” suspension should raise it another 2”?

So 4” total over stock? Can someone calculate this for me as well.

 

[kayakmike]

https://www.vcalc.com/wiki/KurtHeckman/Breakover+angle

Gladiator specs:
Wheelbase: 137.3"
Ground clearance: 11.1"
Breakover angle: 20.3°

Doesn't specify where the 11.1" ground clearance is measured, but probably not at center of truck. To get a breakover angle of 20.3° with the given wheelbase, the ground clearance would need to be 12.3" at the center of the truck.

If you add 2" of height, that gives 14.3" of clearance at center of truck, or breakover angle of 23.5°.

If you add 4" of height (37" tires & 2" lift), that gives 16.3" of clearance at center of truck, or breakover angle of 26.7°.

 

[WarMouth]

Ok so I was actually wondering the same thing as to what the BO angle would be stock with 35's and also 2" lift w/ 37's. So I looked up how to calculate the BO angle and am now a little more confused than when I started. To start with I am not sure how they (Jeep) are getting their BO angles as it doesn't add up.

The specs from Jeep are listed as 137.3" wheelbase and 11.1" GC on a rubicon. They have a stated BO angle of 20.3 according to the spec sheet.

When I use those figures I come up with only 18.4 degree so I am thinking the ground clearance number is incorrect for this calculation. To get a BO angle of 20.3 you need a ground clearance of roughly 12.3". So I am not sure where the 11.1" GC figure comes from but lets assume it is not between the wheels and use the 12.3" GC figure for the rest of the calculations. Again that is assuming the GC of 11.1 is either the front or rear bumper.

So for just swapping in the 35's (1" GC lift) gives us a BO angle of 21.9

And for the 37's with a 2" lift (4" GC lift) we should have a BO angle of 26.7

GC= Ground Clearance
BO= Breakover

 

[WarMouth]

Wow obviously it took me more than 21 minutes to do those calculations. Wish I had just googled and found that site instead of doing it old school

 

[bairdy380]

So this is starting to concern me with knowledge of local conditions. Checked my current set-up and it's calculating out around the 28 angle mark. Which I know gives just enough clearance on burms, entry/exits and similar here (it's a 2008 hilux only running 2" lift on 33's...so nothing extreme).
Raising the gladiator to 2" and 35's still seems to be around 24...which is stock for all other competitors here. This may well be the deal breaker...I dont want a rig that will scrape and damage on every trip (regardless of belly plates)...it's a real concern as I've seen too many similar get hung up here and bend/break stuff.

 

[RedTRex]

https://www.vcalc.com/wiki/KurtHeckman/Breakover+angle

Gladiator specs:
Wheelbase: 137.3"
Ground clearance: 11.1"
Breakover angle: 20.3°

Doesn't specify where the 11.1" ground clearance is measured, but probably not at center of truck. To get a breakover angle of 20.3° with the given wheelbase, the ground clearance would need to be 12.3" at the center of the truck.

If you add 2" of height, that gives 14.3" of clearance at center of truck, or breakover angle of 23.5°.

If you add 4" of height (37" tires & 2" lift), that gives 16.3" of clearance at center of truck, or breakover angle of 26.7°.

Great info, thanks. Didn't think I would be able to keep up with JK/JLs

 

[BosRacing]

Here's how I plan to improve breakover angle.... 40" tires, high clearance tube bumper and angle cut behind the rear tire. As soon as my LE gets here, I will give you the exact angle but my guess is 45-50 degrees.

 

[bairdy380]

G'day BOS, throwing 16" GC and 137.3 WB into the calc still only give 26.2 breakover. (using the base figure of 11" GC...I gave you 5" as what it may increase)...I could be well wrong in the real world...but the front wheel being so far foward and creating such a long wheel base actually reduces the off-road functionality of this particular model. I'm hoping the image I include will help some know what on earth I am on about.

 

[dmw]

I found this thread and was really interested in where it was going but you all stopped. I guess there comes a time where you just throw down the calculator and hit the trail

I have not got my Sting-Grey JT yet, so I will search some more. I am curious on the height of the midpoint between the wheel base after 35's with a 2" lift and without and/or 37's with a lift.

That being said, on my easy wheeling in the bush i don't bring a protractor, I just hope i'll make it.

and just to clarify, Ground Clearance is the lowest point on the jeep right?

 

[Oatmeal]

What's the difference in BO angle between Sport and Rubicon? I assume the Rubicon is better from the factory?

 

[LongTimeListener]

If you add 2" of height, that gives 14.3" of clearance at center of truck, or breakover angle of 23.5°.

If this is correct, then you'd be the same as a Colorado ZR2 (23.5) and better than a stock JLU Rubicon (22.6). 35s would give you an extra inch and improve things further. Honestly, at 24° or better, I stop being worried. You might drag occasionally, but if you can do more than a stock JLU Rubicon (on 33s), you should be fine in most situations.

 

[jeepncrowd]

I don't think ground clearance has a common established definition. Some say to the lowest part of the underbody/frame some use the lowest point under the vehicle (bottom of the Diff). This means that comparing between vehicles can be challenging.

When it comes to breakover. Sure the JT may drag more, but that never really seemed to stop it on any of the videos. It just scrapes over and drives on.

 

[bairdy380]

You are correct Jeepn.... Ground clearance in reference to break over is the lowest point effectively at the centre of the vehicle (only used for calcs) The you have true "ground clearance" which in the real world is generally the bottom of the pumpkin on the diff...ie what is going to hit something eg rocks....or how deep a rut can you drop into, before you have a hair raising tram track ride sitting on the diffs down a hill with no wheels physically touching the ground! (Been there)

 

[Krazy]

I plan on keeping mine stock , how big of a curb at the mall can I go over ?

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