Airsoft BB madness

[Crocks]

So I have been running the 36x13.5x15 bias Irocks for a little over a year. When I mounted these tires I added 9ozs of plastic airsoft bbs to each tire. Worked very well super smooth up to 60 (as fast as I can get it around here), with an occasional death wobble between 10-35 MPh when hitting bump to throw bbs off. It was rare then so wasn't an issue

But now, now they get the death wobble off any little change in payment at the same mph. Much more frequently, so bad I'm about to just go have a tire shop Balance them as good as they can. I checked the front end n all components, everything  is tight. I feel maybe the bbs have gotten somthing on them, maybe moisture

Any ideas are entertaining 

[SqWADoosh]

They have very likely deteriorated/disintegrated. They are known to do that. Especially if you went with cheaper bbs.

[kneedownnate]

If you wanna do it right and take full advantage of not running clip/tape weights, get dynabeads

[:)bestgen4runner]

I suspect moisture in the tire has caused the BBs to freeze and stick in one clump.
Some people put a small amount of antifreeze in the tire to avoid this. 

[SqWADoosh]

I suspect moisture in the tire has caused the BBs to freeze and stick in one clump.
Some people put a small amount of antifreeze in the tire to avoid this. 

He would hear an audible "THUMP THUMP" of the block of bbs hitting if that were the case.

[:)bestgen4runner]

He would hear an audible "THUMP THUMP" of the block of bbs hitting if that were the case.

I have no experience with this issue, But I believe they can also become frozen to the inside of the wheel.

[Crocks]

He would hear an audible "THUMP THUMP" of the block of bbs hitting if that were the case.

I haven't heard anything like that, when I stop the "swoosh"  sounds the same. although I did notice when I drove it home from snow the other night at 5psi, they didn't wobble at all dead smooth. I was at 20psi before, I may try 15 next. If all else fails I'll pop the beed n let you guys know.

[H8PVMNT]

I have had great success with lead shot.  What a tire needs will vary though.  An out of round tire needs more shot.  It could be that with your tires wearing in they need a little more weight than what you have in there.  9 OZ may be on the light side for that tire based on what I have experienced.  My 35x12.50 15s typically need about 11-12 OZ.  I have a kind of eggy BFG KO2 that needed 14 OZ to feel right.