There's always been a problem with getting a big heavy tire "balanced" and and not creating vibrations. But, off road tires always have that "bounce" to them.
BB's and dynamically moving weights help - sometimes.
Here's what happened to me:
I punctured a sidewall with cactus. A sidewall flexes too much for repairs to last very long. I took it to the dealer where I bought the 35x12.50 MTR. They gave me a new one under their road hazard warranty.
When they tried to balance it the readings kept changing. The balancer would tell them 1 oz inside, 6 outside. When they put that weight on and re-spin it, it'd get worse, like 7 inside and 24 outside. Readings were different each time they spun it.
No, the balancer was working fine on other tires, just mine seemed to affect it.
Finally they put it on another machine - along with their "expert" that had tried with the first machine. This one was far more sophisticated.
First step it spins it up to speed and recommends the weights to use.
Then it pushes a big roller up against the tire, pushing hard, simulating the pressure the tire would "see" on the vehicle. That detects soft spots in the tire.
Next it measures any runout from the rim and tire, both laterally and radially.
Then spins it up to speed and measures the "actual" balance with the weights the standard machine would recommend.
I may have gotten the procedure backwards here, but you can see what it measures.
That tire and rim combination was exerting 107 lbs of sideways force when spinning, even when balanced with weights!
That's probably why the other standard balancer was having so much difficulty. The sideways force was probably throwing it way off.
The machine recommended the tire be rotated on the rim! It told where
to place a mark on the rim, and where
to put a mark on the tire. Then you break the tire down off the rim, line both marks up
That's sort of an old trick we used to do when excessive weight was needed, sometime we'd rotate the tire's position on the rim 180 degrees and hope. Now it told us exactly how much to rotate it
. At best it was a guess before.
These calculations were not only based on the runouts, but included the soft spot in the tires.
Retesting it showed it was now 26 lbs! From 107 to 26! The machine indicated that was well within acceptable limits.
He balanced it with weights and put it on the front of my Jeep.
SMOOTH AS GLASS! At least on that corner, all the way up to 90 MPH. It was immediately obvious that the other wheels needed it too.
I didn't have time then, but It'll get done next week.
So - if you have that "bouncy bouncy" even after the tires have been balanced, you may want to try this.
Here's a link to the maker - Hunter Engineering - of that ROAD FORCE balancer, the site also has a locator where you can find one.
I'm sure they are expensive machines, and not everyone will have them. Those without them will probably poo poo them.
The place that took great care of me was America's Tire in Palm Desert, CA.
I wonder if this might help with DW problems too?
GSP9700 Road Force Measurement System