BFG KO2's Out of Round? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > Tires & Wheels

Join Wrangler Forum Today


Like Tree2Likes
  • 1 Post By tw_jeep
  • 1 Post By crippled
Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-12-2018, 02:14 AM
Thread Starter
  #1
Jeeper
 
Rod B's Avatar
 
Join Date: Jan 2015
Location: SW Washington State
Posts: 193
BFG KO2's Out of Round?

I bought a set of 5, 35 x 12.5 R17 BFG KO2's a year ago at Discount Tire. They were mounted on the 17 x 8.5 MB Razor wheels I had previously purchased from DT. I had the first rotation completed at a little over 7k miles, 6 months. I use a 5 tire rotation. Discount Tire said everything looked good. I had the second rotation completed a little over 5k miles, about 3 weeks ago. Discount Tire said the balanced the tires and all looked good. At this point I have a little over 12k miles on the tires.

After the 2nd rotation I noticed a mild harmonic vibration starting at 50 mph, peaking at 55 mph and mostly gone at 60 mph. I took it into a different Discount Tire location, near my work and asked for them to be balanced again. I still had the vibration, so I rotated them myself, driving after removing each tire to see if one was causing the issues. No real change. I then scheduled a Road Force Balance at my original DT location. They said they had to rotate a tire on a wheel, but all was within spec now. I still have the vibration.

I started doing some research online and it seems it is not uncommon for KO2's to have issues being out of round. Has anyone else had this issue? I checked all the suspension components and everything is tight. I have OEM ball joints, but they were new after installing the KO2's as I purchased a new Rubicon front axle for my Sport model shortly after buying the KO2's. I've been extremely happy with Discount Tire in the past. I have purchased 5 sets of tires and 4 sets of wheels from them since 2012. I did purchase their certificates for the KO2's, so I'm assuming there should be no warranty issues if they are out of round. Anyone else have out of round issues with the KO2's? Any suggestions for testing roundness? Any other things to check?

Rod B is offline   Quote
Old 02-12-2018, 08:48 AM   #2
Jeeper
 
Join Date: Oct 2017
Location: Houston, Texas
Posts: 348
Two things to consider.

First is aftermarket wheels. Are these "hubcentric" and if so are they an exact fit to the Jeeps flange?

Second, when I hear of owners constantly balancing wheels, my first thought is an out of round tire or a problem with internal construction. Out of round would normally be noticed from new. Internal problem can happen any time. Both will probably show up when spinning the tire. I would jack the Jeep up off the ground. Start engine and put in gear. Carefully observe the outer diameter of the tire as it rotates. There should be almost zero runout. If you see a high spot, that is bad. No amount of balancing will fix that.

If you have a same type spare, you can install it on one wheel at a time till you find if one of the tires is the one causing the vibration.

__________________
2017 JKU RECON silver
realshelby is offline   Quote
Old 02-12-2018, 06:27 PM
Thread Starter
  #3
Jeeper
 
Rod B's Avatar
 
Join Date: Jan 2015
Location: SW Washington State
Posts: 193
Thanks for your reply. The wheels are MB Razor Wheels. These are a Discount Tire brand wheel that is no longer available. Per Discount Tire they are lug centric. I haven't looked in the wheels for any type of centering ring. I had already done a 5 tire rotation, driving the Jeep with a different one of the 5 wheel/tire assemblies off. There may have been minor changes in the vibration, but there was never a time when having one of the five off the Jeep got rid of the vibration. When you say internal construction problem, this can also cause an out of round condition? If you can't see it visually could you still feel it when driving? I haven't tried looking visually with the tire off the ground yet.

Quote:
Originally Posted by realshelby View Post
Two things to consider.

First is aftermarket wheels. Are these "hubcentric" and if so are they an exact fit to the Jeeps flange?

Second, when I hear of owners constantly balancing wheels, my first thought is an out of round tire or a problem with internal construction. Out of round would normally be noticed from new. Internal problem can happen any time. Both will probably show up when spinning the tire. I would jack the Jeep up off the ground. Start engine and put in gear. Carefully observe the outer diameter of the tire as it rotates. There should be almost zero runout. If you see a high spot, that is bad. No amount of balancing will fix that.

If you have a same type spare, you can install it on one wheel at a time till you find if one of the tires is the one causing the vibration.
Rod B is offline   Quote
Sponsored Links
Advertisement
 
Old 02-12-2018, 07:39 PM   #4
Jeeper
 
Join Date: Oct 2017
Location: Houston, Texas
Posts: 348
If your wheels are lug centric, that is a lot less desirable than hub centric. Hub centric is a much more accurate way to mount the wheel to the Jeep. Factory wheels are hub centric.

An internal problem might not be too obvious, but in my experience something that causes a vibration usually has something that is apparent once you locate where it is.

Knowing the wheels are lug centric, checking for runout is even more important.
__________________
2017 JKU RECON silver
realshelby is offline   Quote
Old 02-23-2018, 05:01 PM   #5
Jeeper
 
steve68's Avatar
 
Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 371
Quote:
Originally Posted by Rod B View Post
I bought a set of 5, 35 x 12.5 R17 BFG KO2's a year ago at Discount Tire. They were mounted on the 17 x 8.5 MB Razor wheels I had previously purchased from DT. I had the first rotation completed at a little over 7k miles, 6 months. I use a 5 tire rotation. Discount Tire said everything looked good. I had the second rotation completed a little over 5k miles, about 3 weeks ago. Discount Tire said the balanced the tires and all looked good. At this point I have a little over 12k miles on the tires.

After the 2nd rotation I noticed a mild harmonic vibration starting at 50 mph, peaking at 55 mph and mostly gone at 60 mph. I took it into a different Discount Tire location, near my work and asked for them to be balanced again. I still had the vibration, so I rotated them myself, driving after removing each tire to see if one was causing the issues. No real change. I then scheduled a Road Force Balance at my original DT location. They said they had to rotate a tire on a wheel, but all was within spec now. I still have the vibration.

I started doing some research online and it seems it is not uncommon for KO2's to have issues being out of round. Has anyone else had this issue? I checked all the suspension components and everything is tight. I have OEM ball joints, but they were new after installing the KO2's as I purchased a new Rubicon front axle for my Sport model shortly after buying the KO2's. I've been extremely happy with Discount Tire in the past. I have purchased 5 sets of tires and 4 sets of wheels from them since 2012. I did purchase their certificates for the KO2's, so I'm assuming there should be no warranty issues if they are out of round. Anyone else have out of round issues with the KO2's? Any suggestions for testing roundness? Any other things to check?

RodB, I'm starting to feel the exact same thing, I'm at 10k on the tires and I had them balanced today, I had them balanced at the end of December and there were horrible, so I had them redone up here in Virginia, no discount in the state, one tire was taking 8oz to balance one side, but the other day it felt like it was hopping down the road, feels like a tires out of round, I'm going to look into it a little father, reply what you find, I'll do the same,

Going to call Matt at discount tire, he seems very knowledgeable in the wheel and tire area,
steve68 is offline   Quote
Old 02-23-2018, 08:56 PM
Thread Starter
  #6
Jeeper
 
Rod B's Avatar
 
Join Date: Jan 2015
Location: SW Washington State
Posts: 193
Update

Quote:
Originally Posted by steve68 View Post
RodB, reply what you find, I'll do the same,

Going to call Matt at discount tire, he seems very knowledgeable in the wheel and tire area,
After the 3rd balance (Road Force), I had my alignment checked and there was nothing there to contribute to the issue. I then went back to my original Discount Tire location and asked specifically about the tire being out of round.

After they were done they said the tires were perfectly balanced and there was no run-out. They recommended hub centric rings and/or ET lug nuts to be sure they were centered on the hubs. They didn't have either in stock. I ordered the correct hub centric rings and installed them. This seemed to improve the vibration significantly. I still have a rotational harmonic going on at the same speeds, starting around 50 mph, peaking at 55 mph and ending at 60 mph.

When I installed the hub centric rings I did find there was a lot of weight on the front wheels for balancing. Here are pictures.





The rears had much less weight on them.





My research on the acceptable amount of weight for balancing states it should be less than 1% of the weight of the wheel/tire assembly. Although the front assemblies have a significant amount of weight, they are under 1%.

Besides the alignment, I've been under the Jeep numerous times looking for something loose and haven't found anything. Discount Tire has always treated me well and I don't have any reason not to trust them. Let me know what you hear from Matt @DiscountTire .

So I'm not sure what to do next. I'm considered calling local dealers to find out if they have any take off wheels and tires and ask them to check out the Jeep and also swap wheels and tires to see if they still get the same result. But that may cost me several hundred dollars with no results, so I'm not eager to try it. If anyone has any other suggestions I'm certainly open to them.
Rod B is offline   Quote
Old 02-24-2018, 07:55 AM   #7
Supporting Member

5-Year WF Supporting Member
 
Join Date: Sep 2010
Location: NW Florida
Posts: 120
Funny thing - I am looking at BFG KO2s and 1 tire shop said they don't have issues and another said they recently have been having quality/ride issues with their KO2s.

I hate spending over $1500 for tires and it can still be a bit of a crap-shoot...
steve68 likes this.
__________________
2015 JKUR with 3.5" AEV lift, bumpers, Pintler wheels with 35x12.5x17 BFG KM2s, AEV ProCal
tw_jeep is offline   Quote
Old 02-24-2018, 01:27 PM   #8
Jeeper
 
steve68's Avatar
 
Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 371
I have the Level 8 wheels and there hub eccentric, so I assume thats not a issue with this, I have to go look at the out of round issue closer, I dont have any cupping so I'm going assume that one or more is out of round, Left Matt a message,
steve68 is offline   Quote
Old 02-24-2018, 10:27 PM   #9
Jeeper
 
IcarusLSC's Avatar
 
Join Date: Aug 2012
Location: Ontario, Canada
Posts: 1,518
Quote:
Originally Posted by realshelby View Post
If your wheels are lug centric, that is a lot less desirable than hub centric. Hub centric is a much more accurate way to mount the wheel to the Jeep. Factory wheels are hub centric.

An internal problem might not be too obvious, but in my experience something that causes a vibration usually has something that is apparent once you locate where it is.

Knowing the wheels are lug centric, checking for runout is even more important.
Almost all factory wheels are lug-centric on Jeeps for decades +. Most of the aftermarket stuff is too... Many claim to be hub-centric but aren't.
__________________
Ϣr
IcarusLSC is offline   Quote
Old 02-24-2018, 10:39 PM   #10
Jeeper
 
Join Date: Oct 2017
Location: Houston, Texas
Posts: 348
Quote:
Originally Posted by IcarusLSC View Post
Almost all factory wheels are lug-centric on Jeeps for decades +. 99%+ of aftermarket stuff is too... Many claim to be hub-centric but aren't.
I don't have a date when they changed, but my 2017 is HUBcentric. Not lugcentric. Hubcentric is a better way to center the wheels rotation.
__________________
2017 JKU RECON silver
realshelby is offline   Quote
Old 02-24-2018, 10:47 PM   #11
Jeeper
 
IcarusLSC's Avatar
 
Join Date: Aug 2012
Location: Ontario, Canada
Posts: 1,518
Perhaps some 2017+ are hub-centric (I'd have to see it), but almost everything Jeep has put out in the past isn't with only a very few exceptions...
__________________
Ϣr
IcarusLSC is offline   Quote
Old 02-25-2018, 12:06 AM   #12
Jeeper
 
Join Date: Jan 2015
Posts: 593
my 14 jku is hubcentric so was my 2011 and 12
realshelby likes this.
crippled is offline   Quote
Old 02-28-2018, 09:31 PM   #13
Jeeper
 
steve68's Avatar
 
Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 371
Just a FYI, friend has KO2;s in the 285 size, he's having the same harmonic issues at 45-55 mph,

And he's had them balanced a couple of times,

Matt left me a message the other day, I'll call him tomorrow,
steve68 is offline   Quote
Old 03-10-2018, 11:23 AM   #14
Jeeper
 
steve68's Avatar
 
Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 371
Matt called back and opened a customer care issue with DT, they want me to get the force balance done at a local shop, have to be next week, but the harmonics are terrible, I have a Costa sunglasses tether sitting on my dash, that thing just bounces along for the ride,

steve68 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






All times are GMT -5. The time now is 09:08 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.