I have been using Counteract Brand from these guys
http://www.alltiresupply.com/a-SFNT.html for about 10 or 15 years and it has completely eliminated shimmy and uneven tread wear. I use them in truck and trailer tires. I operate extremely light bulk hauling equipment, under 24,000 tare, which is very susceptible to tire hop and the beads have completely eliminated. I recently sold my heavy tire balancer for scrap iron because it hadn't been used in so long. I haven't tried it in smaller tires because I have been trading pickups before the the original tires are worn out. I think they do work in smaller tires because some of them find their way into the driver's tires.
