New KM2's vibration around 45mph
Thread Starter
JK Super Freak
Joined: Oct 2007
Posts: 1,446
Likes: 0
From: Statesboro, GA
New KM2's vibration around 45mph
I just got BFG KM2's 35x12.50x17 put on my jk 2dr.
They had 50psi in them and I have dropped it to 32psi.
I have not done the chalk test yet but have a question.
My KM (rubi tires) rode smooth at all speeds. The new KM2's
start out smooth then I get a vibration around 45mph up to about 60mph.
If they were not balanced correctly wouldn't I get a vibration at all speeds.
Anybody have any suggestions?
They had 50psi in them and I have dropped it to 32psi.
I have not done the chalk test yet but have a question.
My KM (rubi tires) rode smooth at all speeds. The new KM2's
start out smooth then I get a vibration around 45mph up to about 60mph.
If they were not balanced correctly wouldn't I get a vibration at all speeds.
Anybody have any suggestions?
Thread Starter
JK Super Freak
Joined: Oct 2007
Posts: 1,446
Likes: 0
From: Statesboro, GA
ya, i've had trouble finding many places that can balance big tires. a lot of wheel weights often signifies the tech doesn't know what he is doing, but could also mean a bad tire. i would give them another chance though. if that doesn't work, call around different places and ask them if they are comfortable balancing large tires. also ask them if they have a Hunter Roadforce balancer.
JK Super Freak
Joined: Dec 2007
Posts: 1,682
Likes: 1
From: P-burg, NJ.
Yep I got it too, around 50-55 mph. I tryed playing with tire pressures and also had the tire balance rechecked. Everything checked out good... Guess we just have to live with it. 
By the way I am running 37's with 30lbs in the front tires and 28lbs in the back......
By the way I am running 37's with 30lbs in the front tires and 28lbs in the back......
Last edited by boots; Nov 3, 2008 at 05:46 PM.
JK Enthusiast
Joined: Jul 2008
Posts: 204
Likes: 0
From: Aurora, CO
I have the 315/75/R16 KM2's (35") and run 30PSI front & rear for daily driving. I don't have any vibes now, but they DID have to be re-balanced after about 3,000 miles.
Check into Discount Tire if there's no improvement after another balance. They can balance & mark the rim THEN mount the tire combining the heavy side of the tire with the light side of the rim.
The techs recommended doing this if problems persisted. (It costs a little more $$)
Check into Discount Tire if there's no improvement after another balance. They can balance & mark the rim THEN mount the tire combining the heavy side of the tire with the light side of the rim.
The techs recommended doing this if problems persisted. (It costs a little more $$)
Last edited by meatsandwich; Nov 3, 2008 at 06:15 PM.
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JK Enthusiast
Joined: Jan 2007
Posts: 148
Likes: 0
From: Dallas, TX
I also had the same vibrations, however mine were near 55mph. After a few trips to the tire shop I still had slight vibrations. I had an appointment at the dealer later in the week for normal maintenance, but when I went to pick it up, I noticed on the payment slip that they had also rebalanced/rotated my tires. I didn't expect much from the dealer considering my JK isn't stock, but when I took it up to speed I was amazed to find that the vibrations were gone! Guess I can't complain about my dealer anymore...but balancing did solve my problem. 
JK Enthusiast
Joined: Jul 2008
Posts: 204
Likes: 0
From: Aurora, CO
You probably just need a balance (like I did) after the tires broke-in.
The KM2's work great for me both on and off road!
JK Enthusiast
Joined: Feb 2007
Posts: 183
Likes: 1
From: Albuquerque
I have 37" KM2s with Walker Evans beadlocks, I don't get any vibes at all, and I only have an average of 2 oz. of weight on each wheel. I have only about 600 miles on these, but why should they change if the tire wears evenly?