Sports: Re: [DucatiST] Dyna Beads

Robert,

A very nice slideshow, so a commercial from Dyna Beads.

As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....

They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.

Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.

They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)

Filip

----- Originele e-mail -----
Van: "Robert McNabb" <rockingm_50remuda@yahoo.com>
Aan: "st2 owners" <st2_owners@yahoogroups.com>
Verzonden: Woensdag 23 november 2011 12:35:45 GMT +01:00 Amsterdam / Berlijn / Bern / Rome / Stockholm / Wenen
Onderwerp: Re: [DucatiST] Dyna Beads

http://www.innovativebalancing.com/HowItWorks.htm

Robert McNabb
Blue Ridge Mountains, Virginia
ST4 1999 RED

--- On Tue, 11/22/11, Rolland Waters <theshadking@gmail.com> wrote:

From: Rolland Waters <theshadking@gmail.com>
Subject: Re: [DucatiST] Dyna Beads
To: st2_owners@yahoogroups.com
Date: Tuesday, November 22, 2011, 11:19 PM

On Tue, Nov 22, 2011 at 3:21 PM, Robert McNabb <rockingm_50remuda@yahoo.com> wrote:

Gary, it's used by many a long haul trucker and I've used it with success on log truck tires.
So to call it snake oil is a bit out there, don't care how many cars you've worked on....
And as a final note, the first time I tried it in my motorcycle tires I had the tire installed at a shop that didn't have it nor had ever used it. They put my tire own with the beads as I weight them out of a bag of truck tire beads. Then they put the tire on their balance machine. It was in perfect balance both front and rear...

I wasn't going to start the flame war. But can you explain just how it is that flying bits of crap magically balance a tire?

Until then, snake oil is not an unreasonable assertion.

And woot! anecdotal evidence, just like the hundreds of thousands of miles I've put on unbalanced van tires, and the motorcycle race trophies I've got on unbalanced race tires. Woot!