Topic: Ever heard of dynabeads?

[MJL]

I've heard of people using dyna beads, BBs, airsoft BBs, golf balls, whatever. My concern is that the inside of the tire has a layer of butyl that acts as a tube to hold the air in. If you damage that layer or wear it out you will have a slow leak that can't be fixed.   IMHO don't do it.

[Borkunit]

I'll believe the concept is plausible.  But my worry would be about damage (especially to a tube) from the beads rattling around in there every time you accelerate and come to a stop.

[Markcb750]

In an effort to improve the finish of precision bores and high speed milling cutters balance of the machine spindle and the cutting tool a becomes significant contribution to size and finish.

Several tool companies marketed "dynamic balancers" which attached to the spindle face or the tool holder.  The devices where intended to eliminate the need to dynamically balance precision cutting tools before cutting.

We tested two devices, one of which was an electromagnet, the other an oil/steel bead system, on our Machining centers. Both would reduce the measured displacement at the spindle bearings due to the imbalance of the boring bar or cutting tool.  Neither made a difference to cutting tests My theory at the time was the system responded to the dynamic loads of cutting and added error to the system, resulting in no cutting improvement. (this was 20 years ago...maybe they are better now)


The point of the BS above is I think you will have transient vibrations from potholes, starting, stopping. with the dynabeads, where proper balancing will not.


BTW I think most (as in greater then 50%) four dimensional imbalances to be pharmacologically based, not  mechanically based.

[Inigo Montoya]

Difference is that a tire does not have to be 100% balanced unlike a precision cutter. I doubt it is even possible to balance a tire 100% or even worth it.

[Markcb750]

Difference is that a tire does not have to be 100% balanced unlike a precision cutter. I doubt it is even possible to balance a tire 100% or even worth it.

I do not know what you mean by 100% balance, never had that applied to a rotating element.

everything has a slight rotational displacement, part due to static errors, part due to dynamic action/reaction. 

The Dynabead system would exhibit many of the traits the spindle balance system, which is my point.

[Frankenkit]

If you look, there are a *lot* of patents on dynamic balancing products, and people have been using them for a very long time.  I doubt the concept would persist for so long if it were completely ineffective.

[mlinder]

Various snake oils have also been sold successfully for thousands of years. That doesn't give them validity.

[Burnboy]

When will mythbusters do an all honda bike episode? They could solve this, tire tread and handling, endless cam chain vs one with a master link, oil......

send it to mythbusters. 

[MJL]

Difference is that a tire does not have to be 100% balanced unlike a precision cutter. I doubt it is even possible to balance a tire 100% or even worth it.

The difference is that the cutter is already held very rigidly, where the tire is allowed to move up and down.

[Beans]

I have used that stuff before. it some what works. Ive also used equal at work on big truck tires.   you will also find that the old school truck drivers will have golf balls in their tires and some will put ani-freeze in them they think the ani-freeze keeps the tire cool. lol  I can see it working because once the tire starts spinning it finds the flat spot in the tire and helps balance the tire but don't think I would ever use it myself.

[Markcb750]

Difference is that a tire does not have to be 100% balanced unlike a precision cutter. I doubt it is even possible to balance a tire 100% or even worth it.

The difference is that the cutter is already held very rigidly, where the tire is allowed to move up and down.

Both models are the same, a rotating mass supported by a spring(s), the vehicle system measured in hundreds of pounds per inch of displacement, the other in hundreds of thousands of pounds per inch of displacement.

Cutting tools move up and down, just in thousands of an inch, not inches as a tire does.

Ask Bill Nye. 

[coyotecowboy]

Maybe I'll get some of these to run along with my inline fliters

[Frankenkit]

just don't try to use them with synthetic oil, your tires will implode.

[MickeyX]

[Frankenkit]

*shrug* well, I put an ounce of the beads in my front tire, marked and removed the nipple weight that had been on there (rather arbitrarily, because it was from 'balancing' the last set, leftover from the PO) and 99% of the vibration from up front is gone.    It's no longer like riding over cobble stones all the time, so 65-70+ were a *lot* more comfortable. All I'm feeling in my hands now is the vibration of the engine, and *that* I can handle.

Really looking for it and feeling for it, I think I can still feel that cobblestone-like wump-wump-wump in my rear tire, so the rest of the beads are going in there to test.

[Achmed]

Haha Kit I think you should try the golf balls first. Add a little antifreeze if that doesn't quite clear it up. Then what? I know! That expanding foam stuff from a can! You'll have a great start on being a cursed PO!

[fuzzybutt]

i think i'm going to try em myself now.

[Frankenkit]

Haha Kit I think you should try the golf balls first. Add a little antifreeze if that doesn't quite clear it up. Then what? I know! That expanding foam stuff from a can! You'll have a great start on being a cursed PO!

I'll leave all that crap for you to try.  I know the beads work for me.

[Frankenkit]

I suggest buying a bag just to look at their properties. They're weird.  They dance around in the static field of the plastic baggies they come in, and when I dropped a bunch they barely bounced or rolled.  Very weird.

[wireman]

I jstu put these in my 750 and 1300 vtx they meade a big difference in the 750.  I had the tires balanced and there was still some shake I thought I would give these a try and wow.  very little shake now.  On the 1300 it's like driveng on a freshly tared road.  They go into the valve stem with a little patience.  They are a polished porcalin and are supposed to be ok in tubes.  There is a guy that has had them in this VTX for 18000 miles and said that they even help the tire wear better and get longer life.  I don' know that for sure since I jsut put mine in but so far I like.

[Frankenkit]

Yeah, wireman, that's the feel exactly.

I used a little electric motor up against the clear plastic tube and just jiggled the applicator back and forth.  Kept 'em moving pretty smoothly. 

Mark where your tire weights are on the 750, take 'em off and go for a ride.  If the shake is worse, put 'em back on, but it might actually improve with the weights off.

[Inigo Montoya]

Something like that would really make it worth mounting your own tires. If you do not have to balance and can use these in  place of that, well that would be great!

[MJL]

Difference is that a tire does not have to be 100% balanced unlike a precision cutter. I doubt it is even possible to balance a tire 100% or even worth it.

The difference is that the cutter is already held very rigidly, where the tire is allowed to move up and down.

Both models are the same, a rotating mass supported by a spring(s), the vehicle system measured in hundreds of pounds per inch of displacement, the other in hundreds of thousands of pounds per inch of displacement.

Cutting tools move up and down, just in thousands of an inch, not inches as a tire does.

Ask Bill Nye. 

You missed my point. One isn't allowed to move, while the other is.

[Markcb750]

You missed my point. One isn't allowed to move, while the other is.

No, I do not think you realize, both are the restrained.  Just one has a much stiffer spring doing the restraining.

The mathematical model(s) used to predict behavior in both systems are generally the same.


It's a physics thing.

Have lots to add, but do not know how to bridge the gap without writing or copying a physics/engineering text book. 


Motorcycle consumer news (an online BS site) says the stuff is snake oil, the DynaBead website  does not provide much insight beyond similar testimonial responses as we see here. 

Given the availability of portable accelerometer based test equipment, I do not understand why decent test results are made available.   

[mlinder]

You missed my point. One isn't allowed to move, while the other is.

No, I do not think you realize, both are the restrained.  Just one has a much stiffer spring doing the restraining.

The mathematical model(s) used to predict behavior in both systems are generally the same.


It's a physics thing.

Have lots to add, but do not know how to bridge the gap without writing or copying a physics/engineering text book. 


Motorcycle consumer news (an online BS site) says the stuff is snake oil, the DynaBead website  does not provide much insight beyond similar testimonial responses as we see here. 

Given the availability of portable accelerometer based test equipment, I do not understand why decent test results are made available.   

I'm with Mark on this one. The claims, simply, make no sense unless I'm missing something very important. As far as I can tell, the behavior indicated by the company is exactly the opposite of what would occur in "nature". I'll wait for the real physics from Mark.