Quote:
Originally Posted by Liam
dude, you're on crack. The beads work great. I have 34" bias ply tires on my 40 and the only thing that would balance them were the beads. It is fairly simple how it works.
read...
How It Works |
Read it and am more convinced it's bunk.
My review ...
1- Tire at Rest - I agree, the little balls will be at the bottom.
2- Tire in motion - Not sure the beads will essentially evenly distribute but I'd buy randomly which with 2,000+ beads may basically work the same.
3- Heavy Spots -
"Every time a heavy spot goes up slightly..." - Huh, The "spot" will go up the same distance every time regardless because it's part of the tire.
"... and quickly" - relative to what ?, but I'll assume that they mean at a open road speed.
"The beads resist this motion ..." Why do they resist this motion but were fine with going to the top of the tire in in step 2. What has changed?
If they mean that a slightly heavier spot on the tire will deflect the tire slightly further out of the general arc of the tire as it rotates at high speed due to centrifugal force then I can see that. That's not in the diagram or the explanation but it makes some sense. Then the beads will "resist" extending their arc due to centrifugal force going out with the heavy spot and act opposite the heavy spot. They are saying that the beads and the heavy spot are acting in an opposite manner in response to the same situation.
"and are forced downward." - Forced by what ? and why downward ?
It would make more sense to expect the beads to follow the heavy spot and it's slightly larger radius but this would result in a more unbalanced tire as the heavy spot attracted more beads. I haven't heard of this becoming an issue so I expect the action of thousands of tiny beads all acting independently is fairly random, constantly changing and basically a wash. This is consistent with the tire tech's report that balancing with beads results in different readings each time and with spressoman's observation that sometimes they ran smooth and sometimes not.
4- Reduced Tire Oscillations - "...the beads move to a final, precise point of counterbalance." - Not sure what they mean by final but whatever. "All this happens in seconds, with no transitional vibration." - Apparently it's so good it fixes the vibration of your out-of-balance tire even before balancing it.
Quote:
Originally Posted by spressomon
You could feel the beads actually NOT working up to around 40mph
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5 - No Tire Vibration - "Tire is vibration free, and beads stay fixed in their position due to centripetal force." - Pretty sure a centripital force is forcing them around in a circle,and since we are talking about the bead being fixed it should be discussed in a rotating frame of reference, but hey physics is hard compared to hawking really, really small balls on the internet.
"Beads not required for balancing are distributed equally on either side." - Side ? I'm sure they meant the same thing as step two.
What happens at the contact patch ? does the fact that the outside of the tire and associated beads traveled toward the axle force the beads up?
and From the DynaBead site ...
Why don't you have tire charts for cars or SUV's?
We do not market to cars and SUV’s intentionally.
The main reason (among others) is due to the style of modern car tires. For cars and SUV’s, traditional weight balancing is the best method.
and for the OP from DynaBead ...
If you are purchasing new tires:
Have the tires spun on a balancer. If the machine is telling you that you need a lot of weight on one side and little weight on the other, then the tire has a lateral imbalance.
Can I put the tire on a balancer to see if it's working?
No. Dyna Beads operates on physics principles , and requires the tire assembly to be in motion against a road surface to detect the exact counterbalance position. An electronic balancer has a solid, fixed mount, and does not allow the tire to react to imbalance. (editorial - )