| Author | Message | ||
     Tempest766 |
So in my other post I mention that I need a new rear tire. Someone posted a link to a video of a guy swapping a tire from a rim using hand tools and dynabeads. To me dynabeads sounds like one of those totally awesome revolutionary things that by the laws of physics should not work, but is backed up by wonderful online user endorsements. This is my line of thinking. When you have loose beads (kind of like sand) floating around in your tire the centrifugal force will cause the beads to seek the farthest location possible from the center of rotation. The inside of the tire is not smooth so they won't easily shift position while the tire is rotating. However, every time you stop they will probably drop to the bottom of the tire. On a relatively circular rim/tire combination the weight/balance issue will be less about distance from the center of rotation, and more about compensating for material density changes in the wheel rubber or rim. Intuitively I don't see how this product could reliably work. Here's a theory. Perhaps what is happening is that they are not balancing the tire but instead are CAUSING a heavy spot that is changing position in the tire every time you stop moving. Over time this will have the effect of distributing uneven wear around the tire so that it appear the tire is wearing evenly. | ||
| Darth_villar |
Backed up by people who want to think it helps. Dynabeads are snake oil, and not backed by real physics. | ||
| Teeps |
http://www.vtxoa.com/forums/showthread.php?296877- Dyna-Beads&highlight=dyna+beads Because cruiser guys are never wrong... | ||
| Hughlysses |
All I know is I helped a fellow Badwebber change the tires on his "new" XB9S a couple of weeks ago, and now my carport has Dynabeads all over it (from his old tires). | ||
| Jphish |
Yep - appears to be snake oil or some counter cosmic law involving string theory & many other phenomenon I dont understand. But here's what I do know: I used em' on a brand new set of PR2's for my 2 month, 14,000 mi odyssey 2 years ago. There were NO wear, balance, vibration, chicken strip or other "round rubber" issues. The rear PR was just a 'tad' past the wear bar at the end - but obviously they worked. (dont ask me why / how - I dunno) AND...I was riding in THIS universe. Though I do feel like a space man sometimes. They even worked great above the Texas 85 mph legal limits - or so my partner tells me. Just my 2 centavos | ||
| Reepicheep |
I didn't use dynabeads, nor any other kind of balancing, in a brand new set of PR2's for about 6 months now, and there were NO wear, balance, vibration, chicken strip or other "round rubber" issues." I did break down and buy a static balancer... but didn't bother to pull the tires off yet and actually balance them. This is probably about the 6th tire I put on without balancing (or dyna beads) and i never had any wear or balance problems. | ||
| Buellhusker |
I have used DynaBeads in a new set of Shinko Ravens on my Uly and they do work. 2OZ for the rear & 1oz in the front. When I removed the Shinkos I salvaged the beads for use in the new RP3 and all is good. | ||
| Djohnk |
I did exactly the same as Buellhusker, even same tire (Ravens). I had the tires balanced also, so I don't know if they work or not. I do know my bike is as smooth as butter going down the road  | ||
| Busykat |
I've used them on 5 pairs of tires thus far. No balancing issues what-so-ever and that's up to 130 mph. Other pluses for them are no worries about lead weights coming off and if you ever do a track day, you need not bother taping over the tire balance weights. | ||
| Jphish |
Yeah - and a little 12v shop vac can be used to suck up & reuse beads - no lead - no waste. | ||
| Reepicheep |
Why would anyone add half a pound of unsprung rotational mass to their motorcycle wheel without a REALLY good reason? | ||
| Busykat |
To balance the tires; and you're adding ounces, not lbs. | ||
| Reepicheep |
According to the Dynabeads instructions, aren't you supposed to add 8 oz of beads to "balance" a motorcycle tire? That's half a pound of unsprung rotational mass. To balance using static weights (if you bother at all) it just takes maybe an oz. | ||
| Schwara |
The person who originally recommended them to me (long time Bueller) said he has been using 1 1/2 oz in the front and 2 oz in the rear for a while now. | ||
| Schwara |
I just found their recommendation chart on the website. http://www.innovativebalancing.com/chart.htm#Motor cycleChart | ||
| Mark_weiss |
Balancing beads could well work. There are a few different types of dynamic balancers for other uses that use the same basic principle. Chances are that the harmonic balancer on your car/truck engine works in this same basic way. The issue that I see with Dynabeads is that they really don't show any solid research evidence. "It feels better" is not enough. Last, it should take no more weight in beads than it would for external weights. | ||
| Tootal |
Last, it should take no more weight in beads than it would for external weights. Actually it should take less since they are riding in the center of the tire and not the rim they will have more of an effect being further from the axle. | ||
| Busykat |
I guess you'll just have to take the "Pepsi challenge" and buy some to find out for yourself.  | ||
| Billyo |
Ride the bike with no weights and no beads first. Then add the beads and see if there is a difference. I have them in two bikes. The last time this discussion came up I added one ounce of weights to the front wheel of my bike and could not feel any vibration so either one ounce doesn't make enough difference to feel or the beads work. Let us know if there is a difference in the way the bike feels with and without them. | ||
| Luftkoph |
walk thru the pits at any track see if they are used,how about at bonneville | ||
| Reepicheep |
It's your bike and your money. I've had just as good results with *no* balancing or dyna beads as everyone else is claiming with the dyna beads. I built a static balancer rig out of parts I found on Amazon. Well under $50, and it will balance hundreds of tires for a hundred years to come. But I doubt I'll be able to feel a difference of balanced or unbalanced. If you feel the need to put stuff into your tires, why not just use tire slime? That gives the same non existent balancing effect, but also provides a real benefit in self healing of minor punctures. | ||
| Blake |
P. T. Barnum was right. Pure snake oil. Some folks like snake oil. I hate seeing them advertised on BadWeB. If it sounds too good to be true... | ||
| Skifastbadly |
I put a cat in my rear wheel. I won't know whether it worked or not until I take off the tire and see if the cat is alive or not. I'm guessing it's 50%. | ||
| Busykat |
P.T. Barnum wasn't an authority on motorcycle suspension/tires was he? Just because you don't understand it, don't knock it. http://www.youtube.com/watch?v=eq263AYgyYg | ||
| Froggy |
Schrödinger's Tire Beads? | ||
| Froggy |
Blake does perfectly understand it, which is why he knows they don't work. That video is a joke and simply prove the beads don't work. Notice how they don't accelerate the bottle to the same high speeds when it is empty? | ||
| Skifastbadly |
Schrödinger's Tire Beads? Probably | ||
| Bluzm2 |
Busykat, If you had the time and inclination, Blake could do the math to prove why it doesn't work. But,,, 99% of us here would be lost after the 1st line of the equation. Unless you're in your 4th year of calc you would be lost as well. Pure snake oil. Many years ago there was a product for sale called TBF. Tire Balancing Fluid... It was a sludge type product you injected into a car or truck tire. There was a real nifty demo they did on a special built machine. The stuff looked to be amazing. However running on a machine and out in the real world with real dynamic forces in play were an entirely different thing. Motorcycle wheels in motion on the street are even more dynamic that a auto wheel/tire. | ||
| Guell |
Doesnt it seem a little fishy that they will do a (fake) test with a drill, but then proceed to tell you that they cant demonstrate it on a tire balancing machine. That doesnt seem odd at all to you? And im the guy who had dynabeads all over hughs carport | ||
| Busykat |
Spinning the bottle at a higher speed would just cause it to rotate more eccentricly, so what would the point be. Let's just agree to disagree on this one. Tempest766 asked a question, I stated my experience, and I'm done contributing to this post. |
