Dyna Beads - Do they work? If so, how?

[Justin]

I'm glad we were finally able to come to conclusion here as to whether Dyna Beads really do work

 

[rushes]

I think the guy that invented Dyna Beads also invented the Deer Whistle.

Pretty clever feller I reckon....

 

[RossKean]

Maybe we should just put some oil in the tires. Just make sure its not Rotella (unless you are running Michelin PR3).

 

[RaYzerman19]

Maybe we should just put some oil in the tires. Just make sure its not Rotella (unless you are running Michelin PR3).

So when do we debate Ride-On?

 

[Daniel78362]

Whlie I don't know or agree that they work, the threoy behind them seems simple. They work like water which wants to find and maintain a constant "level".

The inside of the tire has peaks and valleys. Peaks being more mass/weight, valleys less. As the tire rotates the beads move to fill the valleys trying to find a "level" within the rotating tire thus bringing blance to the tire.

Thats my simple take.

Daniel

 

[Redfish Hunter]

Which makes sense except that there is no guarantee that the "low spot" in the tire is where the weight needs to be added. In my mind it would be just the opposite.

But what do I know? I am still disgusted with:

Carver and Friends using Butt Beads to balance each other.

The fact that we cannot lubricate the inside of the tire with olive oil so that the beads rotate freely.

 

[Chuck35]

So when do we debate Ride-On?

No need, It just works!

 

[2fjr]

For your entertainment.

 

[Fred W]

Whlie I don't know or agree that they work, the threoy behind them seems simple. They work like water which wants to find and maintain a constant "level".The inside of the tire has peaks and valleys. Peaks being more mass/weight, valleys less. As the tire rotates the beads move to fill the valleys trying to find a "level" within the rotating tire thus bringing blance to the tire.

Thats my simple take.

Daniel

I agree with RFH, the inner surface of the tire has no direct correlation to where the heavy and light spots would be. If it was as simple as making the tire more uniform on the inside to make the balance perfect the manufacturers would have been doing that for a long time.

Plus, that doesn't explain how the Centramatic balancer system works, (which is assumed to be via the same physics.)



Having the weights in a separate tubular ring attached to the wheel does eliminate almost all of the negatives of the Dyna Beads that go inside the tire carcass. No sticking, no worries about the tire flex at the contact patch, and nbo worries about messing up the tire bead seal when mounting or the valve core when checking / adjusting pressures.

The one downfall that the Centramatic idea doesn't overcome is the one mentioned in ionbeam's last post. Because the balancing media is mobile the weight will always collect at the bottom when the wheel is at rest.

The particles will not disperse around the wheel to the appropriate light places (the means by which we still have not fully established) until the wheel reaches some minimum speed. That means that before reaching that speed, after every stop the wheel will be very poorly balanced, much worse so than the unbalanced wheel. Although this may not result in much vibration, what might that do to a relatively lightweight motorcycle's handling at lower speeds or to tire wear?

 

[timk]

I have a version of those weights suspended in fluid in the ring on the hubs of my motorhome, they work. In the older days,semi truck drivers used golf balls.

 

[steve'o']

If in fact they do work, I really don't think any of us get the mileage out of a bike tire to warrant the cost of new beads every time you change a tire. Again if they do work, maybe in the tires of cars or tractor trailers that put on many more miles they may be advantageous, but on a motorcycle tire I think the cost factor out weighs the performance. I have a local guy who will install a tire and balance it, with lead weights, for $15 off the bike. If I had to put new dyna beads in every tire change, it definitely cost me a great deal more, and I don't think my mileage would improve enough to offset the cost. Just my opinion.