If it wasn't for bad luck... BFG KM3 Failure - Polaris RZR Forum - RZR Forums.net
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post #1 of 11 Old June 15th, 2019, 05:43 PM Thread Starter
 
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Thumbs down If it wasn't for bad luck... BFG KM3 Failure

Well less than 100km on the new tires and this happened...

Running 16psi and clipped a small rock about 50m up the forestry road from my buddies driveway. Felt it kick up and clip the trailing arm and it must have pinched between the arm and the tire. Rear end got real drifty in a hurry!

Just a plain boring section of well maintained and graded road at about 50km/hr and a healthy dose of bad luck.

Worst part is that I was in the middle of some clutch tuning with my new heelclicker kit and I never got to finish lol. Could have at least waited until I finished tuning the clutch to blow!

I really love the tires otherwise. Very predictable in how they break loose and drift, hook up great in the loose over hard type desert terrain we have here. I started running them at 16/17psi f/r and they were great in the high speed sections but found them pretty harsh in the slower speed 4x4 type terrain so I dropped it down to 15/16psi and they were fantastic all around at that level. Might be too low for durability I guess?

How are everyone else's KM3's holding up? And what PSI and terrain are you riding?

Really hoping this was just a bad break and not indicative of how these tires are going to hold up in the long term. Ordered a replacement and I'll be really bitter if this turns into throwing good money after bad.
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2014 XP1K

BoonDocker Ripp Tied Clutch w/Heelclicker Kit - Special Carriers A-Arms - ZRP High Clearance Radius Rods - RacerTech steering arms - Method 401's - 32" BFG KM3's - Shock Therapy Stage 3 kit and sway bar - SSV Works overhead 4 - Mastercraft 5 points - Polaris half windshield - 4-6" A-pillar light bars - ProArmor Doors - Sawgrip chainsaw mount - ISOTA full box - Spring Brake Thingy - Drake extinguisher mount ...and a never ending wish list!
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post #2 of 11 Old June 15th, 2019, 08:48 PM
 
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First Name: Robb
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Re: If it wasn't for bad luck... BFG KM3 Failure

Wow. That is some rotten luck. Looks like that rock was pretty sharp. Appears to be a nice clean slice. Here's to hoping you have a better run next time.

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post #3 of 11 Old June 16th, 2019, 02:48 AM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

Surprized at the tire pressure. I never run any tire over 12 PSI, what does evryone else run?
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post #4 of 11 Old June 16th, 2019, 07:12 AM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

Higher tire pressure is good for preventing pinch flats and bead breaks, but wonít do you any favors with cuts and penetrations. When something sharp impacts the tire, the less air pressure the more it can deflect and concave over/around the object. If the pressure is higher the tire is less able to deflect and the object more likely to puncture. Thatís always been my understanding and experience. I run 8psi in my tires, I avoid square edges and such, and even at high speeds in very rocky PA trails never had an issue. Of course getting a sharp rock in between the trailing arm and tire is kind of a curveball.
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post #5 of 11 Old June 16th, 2019, 11:22 PM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

Freak accidents can happen to any tire. I run ITP Ultracross R Spec, which are used by a lot of desert racers and known for their durability. I sliced the sidewall on a rocky hillclimb with lots of loose, sharp shale and lots of wheelspin. The same could have happened no matter what tire I was running at the time. I run around 15-17 psi, because a lot of the areas we ride are both very rocky and fairly high speed, and pinch flats are the most common tire failures. Riding in these conditions, you hit a lot of rocks you never even saw because they were buried just beneath the sand and you don't realize they're there until the hit jars your teeth.
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post #6 of 11 Old June 18th, 2019, 09:55 AM Thread Starter
 
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First Name: Max
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Re: If it wasn't for bad luck... BFG KM3 Failure

Quote:
Originally Posted by Irondogracer View Post
Surprized at the tire pressure. I never run any tire over 12 PSI, what does evryone else run?
It depends on several factors - type of tire, type of terrain, speed you drive, etc.

My general rule is rock crawling run it low ~ 6-8psi
General trail riding at mid speed ~ 10-12psi
High speed desert ~ 15-20psi

Again that is dependant on the tire though. My business partner runs Mambas half the year and keeps them at 2psi in all terrain lol.

I know it was a stroke of bad luck but I was just hoping to hear what some of the other guys running the KM3's found for their sweet spot. I'm the only guy in my area running these tires so I rely on my internet friends for input

2014 XP1K

BoonDocker Ripp Tied Clutch w/Heelclicker Kit - Special Carriers A-Arms - ZRP High Clearance Radius Rods - RacerTech steering arms - Method 401's - 32" BFG KM3's - Shock Therapy Stage 3 kit and sway bar - SSV Works overhead 4 - Mastercraft 5 points - Polaris half windshield - 4-6" A-pillar light bars - ProArmor Doors - Sawgrip chainsaw mount - ISOTA full box - Spring Brake Thingy - Drake extinguisher mount ...and a never ending wish list!
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post #7 of 11 Old June 18th, 2019, 07:14 PM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

My 2019 1000 XP4 had KM3s 30s I swapped the bighorns on it from the dealer, Arizona desert trails have a lot of baseball sized rocks so I run mine at 15 lbs..some areas have high speed roads for many miles to get deep into the trails so I start at 17 and work down to 15-14...seems to work out well...tried 12lbs in rockier trails and did not notice a great deal of comfort or performance difference from 14-15..so thatís where they usually stay to void out pinch flat chances ...no problems at all..very predictable tires. We dont have a lot of rock crawling areas where we ride..but some very rocky trails mixed with high speed
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post #8 of 11 Old June 18th, 2019, 07:41 PM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

I currently have about 18 psi in mine but I do want to air them down, way to harsh a ride.



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post #9 of 11 Old June 24th, 2019, 01:45 PM Thread Starter
 
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First Name: Max
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Re: If it wasn't for bad luck... BFG KM3 Failure

Well this is the replacement tire that I just installed on its first trip out in the dirt...
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2014 XP1K

BoonDocker Ripp Tied Clutch w/Heelclicker Kit - Special Carriers A-Arms - ZRP High Clearance Radius Rods - RacerTech steering arms - Method 401's - 32" BFG KM3's - Shock Therapy Stage 3 kit and sway bar - SSV Works overhead 4 - Mastercraft 5 points - Polaris half windshield - 4-6" A-pillar light bars - ProArmor Doors - Sawgrip chainsaw mount - ISOTA full box - Spring Brake Thingy - Drake extinguisher mount ...and a never ending wish list!
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post #10 of 11 Old June 24th, 2019, 05:36 PM
 
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Re: If it wasn't for bad luck... BFG KM3 Failure

Yikes. That scratches these of the list for me. Sorry to see that


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post #11 of 11 Old June 24th, 2019, 09:18 PM Thread Starter
 
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First Name: Max
My RZR: 2014 XP1K with lots of goodies!
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Location: Penticton, BC, Canada
Posts: 284
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Re: If it wasn't for bad luck... BFG KM3 Failure

Quote:
Originally Posted by gtsum2 View Post
Yikes. That scratches these of the list for me. Sorry to see that


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Yeah... Performance is unreal - reliability, not so much...

2014 XP1K

BoonDocker Ripp Tied Clutch w/Heelclicker Kit - Special Carriers A-Arms - ZRP High Clearance Radius Rods - RacerTech steering arms - Method 401's - 32" BFG KM3's - Shock Therapy Stage 3 kit and sway bar - SSV Works overhead 4 - Mastercraft 5 points - Polaris half windshield - 4-6" A-pillar light bars - ProArmor Doors - Sawgrip chainsaw mount - ISOTA full box - Spring Brake Thingy - Drake extinguisher mount ...and a never ending wish list!
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