I'm using 2 oz of Crossman High Impact .25 grams 6mm seamless Airsoft BB's in my 5.30 x 12 utility trailer tires, and they run smooth.
The beads do not always work in all tires. From the Dynabeads web site
Dyna Bead web site wrote:
Dyna Beads ® with Low Profile Tires
You will note that we do not market to cars, SUV’s or personal minivans, mostly due to low profile, low aspect ratio tires.
If you have low profile tires, that being any tire with an aspect ratio 65 or below, you may have balancing issues that precludes using Dyna Beads as the sole balancing method.
Our official policy is that we do not advise using Dyna Beads in any car, truck or SUV tire with an aspect ratio 65 or below unless used in conjunction with weights.
I did try the bb's in some 65 aspect ratio tires on my Honda Odyssey, and it worked most of the time. After a few thousand miles, had the beads removed and the tires road force balanced and learned that one of the 4 tires could not be balanced at all. So....maybe the BB's work in 65 aspect ratio tires also?
There are some posters on this form that use the airsoft BB's to balance their motorhome tires.
Let us know how it works if you decide to try the BB's.
Fred