We have been using balance beads for about 2 years in our school bus tires at work. Mostly 11 r22.5 and 225/75 r16 radials. The small glass beads work the best, the larger beads ( BB sized ) don't work at all. The small beads static cling to the inside and maintain balance with slow speed and lots of stops. The larger beads balance out at highway speeds but fall to the bottom every time you stop. We have now switched to a shredded plastic type material, no miles yet to determine if its working. Best way for the DIY is bubble balancer, shop around you can find used ones pretty cheap.
