| Author | Message | |||
     Msr203 |
Has anyone used dyna beads in there tires, how do they wear on the in side of the tire? | |||
| Dpb |
They work great! Don't really wear, just roll to where their needed. | |||
| Preybird1 |
Not this can of worms! Get ready for some debating!! | |||
| Charlies_s1 |
Snake oil????? | |||
| Msr203 |
Or are there other products for dynamic balancing that work better | |||
| Jdodd |
/popcorn | |||
| Jramsey |
 Where's Blake? This is one of his favorite topics.  | |||
| Buellhusker |
I used them in a new Shinko Raven on the rear of my Uly and by the way I hated the Raven tires, they wondered around and had a slight vibration not a shake like out of balance but more of a vibration. So I guess the Dyna Beads worked OK however when I mounted up my new set of Pilot Road 3 I went with the old stick on balance weight method. | |||
| Kalali |
What the heck is a Dyna bead??!! | |||
| Jramsey |
"What the heck is a Dyna bead??!!" Little plastic balls about the size of #7 bird-shot that when installed in the tire they supposedly balance the tire while you ride. | |||
| Redefine420 |
I bought them whilst drinking. When I received them I said "Oh yeah". I still have them somewhere, unopened. If if I can find them I'll send them to anyone willing to pay shipping. I think they are b.s., I'd love some concrete proof that they work. Wouldn't a liquid in the tire do the same thing? | |||
| Greg_cifu |
Yes, a liquid WOULD do the same thing. The problem is finding a liquid that doesn't corrode the metal in the rim and valve stem, isn't a solvent that will harm the tire and isn't combustible. BTW: Dynabeads are ceramic, not plastic. If you don't believe in how they work, look up truck tire balancing rings. They're basically the same idea, except it's balls in a round metal track, bolted to the rim. It takes more energy to swing something at the same RPM and a larger radius. In the absence of that energy, the balls seek the point of lowest force. That point is closest to the center of the wheel. That also happens to be the light-spot on an out-of-balance wheel. They will constantly seek that light spot, regardless of RPM or where the tire measured heavy. I've not used them but, the physics is sound. | |||
| Blake |
<sigh> They don't balance anything. They may very well damp vibration due to an imbalance. The stuff they show is convincing, but close analysis shows the lie. The fact that they don't work when you put a wheel/tire on a spin balancing machine ought to give you a clue. | |||
| Blake |
For all the rest of the rehashed discussion on Dyna Beads, see the following:
| |||
| Greg_cifu |
On a spin balancer, the wheel is held perfectly concentric so the tire doesn't begin an out-of-balance orbit (bouncing up and down). It's that very motion that forces the beads to find the light spot. This video illustrates the effect (just found it with a quick search). http://youtu.be/eq263AYgyYg Again: I don't use them or ANY balancing method on my bikes. Premium Z-rated motorcycle tires are usually close enough that I don't bother (line the dot up with the valve stem and good to go). I have an on-the-vehicle balancer and the only tires I found out of balance enough to bother were the Metzeler Sahara 3 tires on my R100GS. Dynabeads ARE popular on motorhomes and other vehicles (4x4s) with hard-to-balance tires. Sorry if this is a bad subject. Would it be better to argue over which oil to use? | |||
| Charlies_s1 |
Oh yea much better! | |||
| Msr203 |
Sorry didn't mean to  just saw them used in a YouTube video about changing tire | |||
| Gmaan03 |
Yeah my second cousins friends brother told him he saw those things on an infomercial! Said they were AMAZING, even cured cancer. You know Chuck Noris's tears cure cancer but he never cries! $9.99 for a set of two, but wait there is more! They will add lead weights with a sticky side to stick to the rims! They claim this will "enhance" the balance....... You only have 5 minutes to buy! | |||
| Greg_cifu |
For those who think it's snake oil: did you watch the video I posted above? Here it is again. How does this demo work? The bottle has a 20 gram (0.7 ounce) weight taped to it and the beads manage to balance that imbalance; no camera cuts, no smoke, no mirrors. I used to think it was BS until I thought about it some more. It's just physics. http://youtu.be/eq263AYgyYg Edit: here is a video showing how the balancing rings work. Same idea, different implementation. Again: this is common on large trucks and motorhomes. http://youtu.be/skY6qvzpNXI (Message edited by greg_cifu on September 03, 2011) | |||
| Kalali |
In my opinion the demonstration and the logic behind it make sense. I'm just not sure they can be scaled to a motorcycle tire. | |||
| Fahren |
I think they are an example of a perfectly fine idea that will never hit the mainstream because it is more of a hassle than a perfectly good, earlier idea (stick-on weights) that is easier and less of a mess to use. Just imagine one spill (or, when you take a tire off a rim), all those little ceramic pellets rolling around a shop floor....... One caveat to note on the Dynabead web site: not for use in racing tires. | |||
| Hootowl |
"For those who think it's snake oil: did you watch the video I posted above?" Did you read the previous thread linked above? | |||
| Msr203 |
I have heard that if you have shop work on tires after putting them in to let them know or they won't like you | |||
| Greg_cifu |
[quote]Did you read the previous thread linked above?[/quote] Yes, I did. The assumptions are that the beads want to fling out and find the maximum radius is the first thought (I used to think that too) but, it doesn't work that way. Because they are held in orbit by the tire carcass, the light spot looks like it's 'downhill' (energy-wise) to the balls. They--therefore--seek the 'lowest' spot (smallest radius). Here is a very good description of why and how it works. The guy also gets into all the practical reasons why they aren't perfect in the real world. Starts at Post 87: http://www.bmwmoa.org/forum/showthread.php?p=68415 4 (Message edited by greg_cifu on September 04, 2011) | |||
| Fahren |
A smart shop will demand that you pick them all up off their floor if you haven't told them, before returning your wheel! LOL | |||
| Msr203 |
When I was a kid I remember taking a lawnmower tire to get fixed and my dad forgot to tell them they had fix a flat in the tire........ That dude was not happy | |||
| Hootowl |
Someone should suggest that Erik Buell Racing compensate for their tire-rim slip and use beads to correct the resulting imbalance.  Something tells me they'll find a different way to deal with it. | |||
| Eshardball |
Gunderwood did a great job of explaining why they serve no purpose in a Motorcycle tire. Kudos to Greg for providing the link. |
Dyna Beads are Snake Oil