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MilitaryRestoration, I'm interested in "why they do that". I run 14.5 x 20 Michelin XL's on my U1300 Unimog (14,000 lbs as in daily use) and run 45 psi. These tires were military surplus and were not very round. After trying from 20 oz to 34 oz of Dynabeads in them and partially solving the 'bounce', I trued them, had them balanced with real lead weights (max was only 10 oz per tire), and now they run pretty good up to 70 mph. I also regrooved them an additional 1/4" while I was at it.
Hint for adding the beads into tubeless tires with rubber stems: deflate then push in the stem with a homemade cable retainer attached to the cap. Pour in the beads then pull the stem back out into place. Lubricant and adding some air pressure behind the stem will greatly help popping them back into the wheel. I also did this with steel stems but success will depend on if the retaining nuts can be removed without spinning the stem. Hint, leave air pressure in the tire until the nuts are removed and the threads are cleaned up.
The tires don't have to come off the truck or be debeaded to add the Dynabeads!
Bottom line based on my experience, Dynabeads are great for an out of balance tire but the physics cannot work on out of round tires.
See [media]http://www.youtube.com/watch?v=eq263AYgyYg[/media] to watch how the beads work.
Got my beads from Inovative Balancing and they were great people while working the tire issues!
BTW, my 14.5 x 20's are on 11 inch wheels and tend to wear in the centers if pressure is any higher. With 15.5's on 10" wheel you might even have to go much lower than 45. I personally would 'tune' the air pressure based on contact pressure/pattern on the flat ground. Rear pressures will undoubtedly need to be lower than the fronts unless you are heavily loaded.
Tennmogger
Hint for adding the beads into tubeless tires with rubber stems: deflate then push in the stem with a homemade cable retainer attached to the cap. Pour in the beads then pull the stem back out into place. Lubricant and adding some air pressure behind the stem will greatly help popping them back into the wheel. I also did this with steel stems but success will depend on if the retaining nuts can be removed without spinning the stem. Hint, leave air pressure in the tire until the nuts are removed and the threads are cleaned up.
The tires don't have to come off the truck or be debeaded to add the Dynabeads!
Bottom line based on my experience, Dynabeads are great for an out of balance tire but the physics cannot work on out of round tires.
See [media]http://www.youtube.com/watch?v=eq263AYgyYg[/media] to watch how the beads work.
Got my beads from Inovative Balancing and they were great people while working the tire issues!
BTW, my 14.5 x 20's are on 11 inch wheels and tend to wear in the centers if pressure is any higher. With 15.5's on 10" wheel you might even have to go much lower than 45. I personally would 'tune' the air pressure based on contact pressure/pattern on the flat ground. Rear pressures will undoubtedly need to be lower than the fronts unless you are heavily loaded.
Tennmogger
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:-/ Wish knew, could've sold you some much much more cheaper.
