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The Math, Your chances of roll-over...RZR VS. RSR-S VS. RZR-XP

16K views 29 replies 18 participants last post by  Tiorum3  
#1 ·
The XP has been a target of misconception & number's blown out of proportion.. It's simple math..

Some information gathered from the Polaris website showing Stats & Safety Engineering Resources Literature - Forensic Clues - Yamaha Rhino UTV Accidents

What Happens in Accidents

Accidents occur when the UTV overturns, usually during low to moderate speed turns.

I'll leave it at that statement while you look at this DATA...

Vehicle_______________RZR_______________RZRS_______________RZRXP
Width________________50"________________60"_________________64"
Height________________10" _______________12.5"________________13"

What is the percentage of height of the RZRs to the Width, The height/width Ratio % (the lower the number the safer the RZR)

_____________________20%_______________20.83%_____________20.31%

In case someone didnt understand this... Basically the RZR's Height is 20% of its width.

The RZR XP has a 0.31% chance by height width ratio of rolling over more than the 50" RZR. Actually the RZR"S" is the most "Dangerous" with a 0.83% more chance of rolling over per the ratio.. This is just the facts.. All within 1%
Again, according to forensic study #28.5 Oct/Nov 2008 (done on Rhino's) UTVs usually overturn at low to moderate speeds. Engine size has no bearing other than your own self control...

Now, Yes I could take in legth, center of gravity, weight ect.. But all thats going to do is back up the claims as the weight increases. That & the math gets seriously complex. K.I.S.S. If you know what I mean..

The Danger is either the Driver, or all in your head.. JMHO, So be safe, Enjoy our new toys and selections..Cheers:)
 
#2 · (Edited)
Time for sleep...

If ya'll want more accurate mathematical proof (it can go any way), just say so, I'll spend some time & see what I can put together...Most of my time has been working suspension equations...complex, but fascinating! :)
 
#3 ·
I didn't read the entire article, but I think you can't transfer those formulas directly across to the RZR family without consideration to the difference in the placement of the center of gravity.

It's not just the height that has to be factored in, but at what height the weight is carried - center of gravity.

It might be worth a poll to see how many owners of each model have rolled.

For example, I have 1.5" spacers on my RZR 4 from day one. Never rolled. And it's not like I haven't pushed it. The longer wheelbase also needs to be factored in as do aftermarket add-ons, type of suspension, lift, etc. JMHO :)
 
#4 ·
I think you might be hitting the Colt 45 a little hard. The ground clearance doesn't really mean much. If you want to appear even semi rational while hitting the juice, you might want to consider the actual center of gravity.
 
#6 ·
I don't feel that would be very accurate, I've seen plenty of 50" RZR on their side, and just driving and riding in them they feel like they want to roll due to the suspension travel they don't have. I feel way safer in my S then a 50" RZR, RZR4 feels very safe too.
 
#7 ·
Yep, that math doesn't work based on GC. It needs to be center of gravity and even then there are more factors that contribute. Also, there are no "S" models that have 12.5" of GC on the stock setup unless you get nasty with the preloads. Polaris got a little generous with those numbers. With proper springs its still only 11.5-12" at most. Also the S is spec'd out as 60.5" wide. redoing your math with 12" GC that's 19.8% which makes it the most stable.

The only true way is field testing.
 
#23 ·
As a recent switch from 50 to S owner it's an easy answer IMO.

You want to upgrade your springs as soon as you can, especially on the 50. The lack of travel on the 50 and the 10.5 inches thinner. No question the S is more stable. With .25 inches of preload on the front and 0 preload on the back I'm at 12.5 and 13. Just get good springs.
 
#10 ·
HAHAHA :rofl3:..it wasn't "scientific".. It was just something to do:D , I like the "colt45" statement, & Jmatter caught on.....(I don't read em anymore either) just skim!

It's too thin, it's too wide???? I was reading all those threads last night & figured, I bet it's too "even"...

I actually couldn't do the mathematical equations to truly figure that crap out...Thats what the Mythbusters are for!! Finally, it's cool to see people "lighten" up... Thanks... Good responses & even the serious ones prove it takes a heck of a lot just to make a point........
 
#11 ·
I've rolled my 50"er twice....once I was climbing a car with one side of it....the other a 250#friend jumped in it and I went balls out slideing on a off camber grade and my tire pressures was a little low to have him in there to. The 50" rzr does not just flop over. The people I take rides actually can't beleive how stable it is. I guess most RZR drivers on here can't drive or are just plain out scared. I get sick of hearing it.....no you can't have a 900 motor because it ain't stable enough. Give a typical "trail" there isn't many of you that could even tink about keeping up with me....and with the 900 motor there would be even less, because power is control to me.
 
#12 ·
Thus the reason one should NEVER trust the math of a man with a Brain injury.:D
What sometimes looks "good" on paper, just doesnt work in the real world:) I'm sure some engineers @ Polaris have it ALL figured out... Just seeing the report (on the Rhino) tells me what they "would" be concerned w/ the most... When I added 1.5" spacers to my 50" RZR it made a huge diff, Just 3 inches? When I went to the RZRS suspension it was WAY better! I dont trust the math on the paper as simple as it is.. Thats why I said its the driver! (Or in your head, in my case:D) Have fun....

I wont be around too much in the pending days so I figured I would double check & make sure I left no open ends this morning.. Enjoy guys.. Mike
 
#13 ·
That math is nonsense. The standard RZR will tip easier than an S, but the center of gravity on a standard is still very low for an off road vehicle. I have had mine in nasty stuff and only had it on its side twice and on two wheels twice. I also do not think it is fair to say that the drivers that put them on their side are not good drivers. Some drivers just push it to the limits and then some.