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craigstumph
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13,110 Posts
Discussion Starter · #1 ·
The tire test is back for 2021. We have expanded the test to include sand and mud as well as rocks so that we can have a better overall look at the tire's performance. The tires we want to test this year include last years champ the Maxxis Roxxzilla vs all other worthy tires we can get our hands on. One of the tires we want to put up against the Roxxzill is the System 3 XTR 370. We have seen some extreme performance out of this tire.

The ultimate Bad Ass Tire in the world needs a crown. But which tire is it? What makes a tire work like no other on rocks, mud and sand? A lot of people have opinions. We at Pro UTV Parts are looking for the best tire in the world that is proven in competition. The things we look for are:

1. Height (taller is better)
2. Grip (softer tire rubber is usually better)
3. Sidewall Grip (lugs help)
4. Flexibility (ability to conform to rocks)
5. Side Wall Strength (puncture resistance)
6. Holds a Line (tires go where you point them)
7. Sidewall rigidity (sidewall does not fold over when turned)
8. Flotation in sand
9. Cleans out in mud to provide traction

I am sure there are other things that matter and we welcome input on this because we are going to set-up the Ultimate "Bad Ass" tire test as soon as we get input from everyone interested.

For a suitable tire test location we chose the Delta Proving Grounds located in Utah (mud and rocks) and the sand and rock at Sand Hollow Utah. The tests will be conducted as fairly as possible because we really just want to know which tire works best.

We were originally only going to test tires for our info so that when we go to Sand Hollow Utah we can out climb our friends. However, this would not be fair to anyone else who is interested and small in our opinion. With that said we open this up to the people who help us by buying our products on the Forum. We only ask that you help us by giving us input into the test because we realize that we don't know everything and value your input. We also will need a few volunteers to help change tires and other things. Someone who can record video and make some You Tube clips would be invaluable.

Let us know what tires you think are worthy and send pics of the tires. Looking forward to your input on what tires you want to see tested and why. We need input on tire size, width, and brand. Personal experience counts if you have used the tires. If you have not used the tire let us know that also. No questions or input are dumb.

Tire Test Parameters:

1. All tests will be conducted on the same machine (Turbo S 4 seater)
2. All test tires will be equally prepared and tested at optimum air pressures for each tire.
3. Tests to be conducted equally and fairly in the same location for each parameter (rock, sand, mud). We are not getting paid to test. We just want to know for our ourselves and fellow forum members.
6. Date is to be determined.

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Premium Member
2019 RZR XP4 1000
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134 Posts
ITP Terra Hook.
 

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craigstumph
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13,110 Posts
Discussion Starter · #3 ·
ITP Terra Hook.
The Terra Hook's largest size is 32". I need to refine the parameters to show that we are only testing 35" and larger tires.

SKUSizePlyMounted Diameter (in)Mounted Width (in)Rated Load (lb)PSITread Depth ()Front or RearWeight (lb)Additional Information
6P093926x9.00R12825.91009.9000565.00003223 /3230.0000UTILITY ATV/UTV
6P094026x11.00R12826.510011.2300695.00003423 /3233.0000UTILITY ATV/UTV
6P094127x9.00R14827.54009.0100565.00003223 /3233.0000UTILITY ATV/UTV
6P094227x11.00R14827.900010.9000715.00003423 /3236.0000UTILITY ATV/UTV
6P094328x9.00R14828.43009.1840615.00003223 /3234.0000UTILITY ATV/UTV
6P094428x11.00R14828.650011.0100760.00003423 /3237.0000UTILITY ATV/UTV
6P094530X10.00R14830.560010.0600760.00003223 /3236.0000UTILITY ATV/UTV
6P094632x10.00R14832.620010.7800880.00003223 /3239.0000UTILITY ATV/UTV
6P094732x10.00-15832.840010.6800855.00003223 /3239.0000UTILITY ATV/UTV
 

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Registered
2020 Polaris RZR Pro XP aka: The Bomb
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794 Posts
I would love to see you test the Roxxzilla standards and stickies both.
 

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Super Moderator
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6,512 Posts
Adding a test for loose dirt & mud will drastically change the results for a few tires. As the discussions we've had what works out west on slick rock does not work on east coast slick trails. Looking forward to seeing how it turns out (y)
 

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572 Posts
Seems like parameters 4 and 7 contradict one another. If tire is flexy to conform to rocks, then it's probably not going to be firm enough to eliminate if from folding over some cornering. Guessing a worthy tire would be one that, when aired down, conforms well to rocks for crawling, but when aired up, firm enough for fast, rally car type riding where one would not want the side wall to fold over.
 

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544 Posts
Might as well throw the Carnivore in the test. I am one that keeps looking for real world input to someone who ran the Carnivore vs. the XTR. In my case 32", but I understand that the larger tires will have deeper lugs.
 

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Premium Member
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551 Posts
Where are you finding a 35” Roxxzilla sticky's to test? Been looking for those since the last BAD ASS tire competition.
 

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93 Posts
It's not a SxS specific tire, but what about the Cooper Discoverer STT Pro? I run it in a 32", should be able to get a 35. Also, are we going to standardize the rim size on this test?
 

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Super Moderator
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It's not a SxS specific tire, but what about the Cooper Discoverer STT Pro? I run it in a 32", should be able to get a 35.
Not Craig but I will tell you that a LT tire will not work well on a SXS. Light truck tires are designed to carry much more weight so the sidewall is too stiff for the weight of a SXS. They will will not flex and conform with teh weight of a SXS.
 

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2014 XP 1000 on portals
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195 Posts
Y’all really don’t think Joe’s beast could flex a 35” lt tire? Surely it weighs more than an old school sammy buggy. The tread compound is going to be a major difference, so to be competitive you’d need a sticky. I wonder how soft a sticky lt tire is vs a standard utv tire, vs a skicky utv tire. Anyway, does anybody make a 35” lt sticky? I think you can get a 37” bfg. Breaking in the sidewalls will be a factor as well.
 

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Super Moderator
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6,512 Posts
I have a set of 37x12.5x15 Creepy Crawlers (stickies) and I have to run them at 2-3psi to get them to flex. My Roxxzillas work better ;)
 

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craigstumph
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13,110 Posts
Discussion Starter · #19 · (Edited)
XTR370

Here is a tire that we are testing mounted up. The durometer is approximately 60 at 72 degrees F. (about 10 points harder than a Roxxzilla). They weigh approximately 58.5 lbs and each tire varies a little bit. I think the sidewalls will work very well (see photo). Tires measured approximately 35.375" at 10 psi on 7" wide wheels pictured. The lugs are huge (approximately 1") These are going to Chainsaw this weekend to break in. Chainsaw is rated 10.

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