Topic: Ever heard of dynabeads?

[Inigo Montoya]

My point is that a wheel is not balanced to 100% if they were, weights would come in 1/16, 1/8, 1/4 oz weights ect.
Oh sure you can use fishing weights if you want but it is just not that big a deal. You can hardly compare it to a drill which has to make precision holes.

As for evidence, why should a company do that? Think of it this way, if it does work according to THEIR tests, you can bet some other place would come up with their own "independent" testing to show it does not work. And then you are no further along than you were before. Besides that, these tests are performed in a lab. You will ALWAYS get people that say "those tests are not real world." Again, you are no further along. You end up getting to the point that if the product is cheap, trying it is simple. if it costs a lot, then you rely on what others have said and go from there.
using "engineering" is just a cover for saying you don't think it will work. no one is going to bust your ass for coming out and saying it. I have a hard time thinking it will work too, BUT it would be awesome if it did.

As a final thing, if I am going to do something with my bike, I am going to listen more to people that have the same bike.

[Burnboy]

kit, did you opt for the installation bottle? and filtered cores?

[mlinder]

I may have figured out part of what I am missing in this equation. Sent the idea to Mark, I'll see what he says, but even if I'm right about what I'm wrong about (wtf, that sounds dumb), it would have a dynamically changing imbalance that would be something like:

(rpm of tire)/(rpm of beads)
where (rpm of beads) is decided by (rpm of tire)*(frictional properties between inside of tire and beads(where a value of '1' would be complete friction, meaning the beads are stationary in relation to the tire, and all other values are fractions)) where (frictional properties between inside of tire and beads) is variable depending on centrifugal force caused by (rpm of tire).

God I hate math.

Anyway, the dynamically changing imbalance here caused by the beads would then have another variable, the original imbalance of the tire to begin with, so the final would be (rpm of tire)/(rpm of beads)*(rpm of tire). The imbalances would occur that many times per unit of time (a minute, in this case)

The increase in the number of imbalances of multiple rotations could, conceivably, reduce the radius that the axle travels around the axis of the actual center point of rotational mass (tempered by the reaction of suspension to imbalance), therefore seemingly reducing imbalance.

Or maybe not...

[Frankenkit]

kit, did you opt for the installation bottle? and filtered cores?

we bought the filtered cores, but I dunno where they are.  I know that's sad, but that's how our garage is. I did get the filler bottle and it makes life infinitely easier.

MLinder: I think you're on the right track, though I have a hard time visualizing this equation.  The concept seems like the way I see it.  The video I posted at some prior point on 'counteract' or 'equal' or some other method of dynamic balancing gives an interesting visual, and while the physics of motorcycle tires are different from the given truck tire, I think the underlying principle is the same.

[mlinder]

mlinder, you sandbagger, you. I would think it increases the moment of inertia (in the third or fourth dimension?) I guess I could see how it evens out imbalances of poor tires, but how, by filling in spots where the rubber is bulged out somehow? I admit I didn't click on any links in this thread.

I LIEK ETE CANDY.

[Frankenkit]

mlinder, you sandbagger, you. I would think it increases the moment of inertia (in the third or fourth dimension?) I guess I could see how it evens out imbalances of poor tires, but how, by filling in spots where the rubber is bulged out somehow? I admit I didn't click on any links in this thread.

I LIEK ETE CANDY.

MOAR CANDY HAR!

[mlinder]

OH YAH! I SEEN ALL YER NEKKIDS ON TEH MAISPAEC!!

[Frankenkit]

OMG I <3 NEKOS!

[Achmed]

mlinder, you sandbagger, you. I would think it increases the moment of inertia (in the third or fourth dimension?) I guess I could see how it evens out imbalances of poor tires, but how, by filling in spots where the rubber is bulged out somehow? I admit I didn't click on any links in this thread.

I LIEK ETE CANDY.

Your humor is beyond my understanding but I think you're laughing at me? That's OK. Good. Carry on.

[mlinder]

mlinder, you sandbagger, you. I would think it increases the moment of inertia (in the third or fourth dimension?) I guess I could see how it evens out imbalances of poor tires, but how, by filling in spots where the rubber is bulged out somehow? I admit I didn't click on any links in this thread.

I LIEK ETE CANDY.

Your humor is beyond my understanding but I think you're laughing at me? That's OK. Good. Carry on.

No, not laughing at you. Just refuting your 'sandbagging' statement. I really am dumber than a bag of wet socks.

[Frankenkit]

and lucky for us all I really love wet socks.

[mlinder]

and lucky for us all I really love wet socks.

That means you love dumb?

[Frankenkit]

I revel in it. Me and deafmutes, we go way back.  Fantastic listeners until they get away.

[mlinder]

I revel in it. Me and deafmutes, we go way back.  Fantastic listeners until they get away.

Ba da dum!

[Inkscars]

  @ until they get away

[mlinder]

Ah, I see portions of your posts are dynamic, Kit. Much like the object of discussion in this thread.

[Operator]

I have recently installed the dynabeads on my 73 750 K (tubed Bridgestones) and have noticed a significant improvement in the way my bike deals with potholes and cracks in the highway. In New Brunswick, we also have a lot of bridges and I have noticed that at higher speeds, I don't get near as much of a bounce in the tire when you hit the seam where the road and bridge connect.

I did a fair bit of reading before I went this route and I am happy with my choice. They run about 15 $ for both tires and my local mechanic, whose opinion I inherently trust, tells me over 50% of his tire installations are requesting these.

So far he has had 0 complaints and only a few people(most riding bikes under 500 lbs) have said they don't notice a difference. Go your own way but I will stick with them.

And they do go in throught the valve for the tubes and you don't require any funky tools

Just my 2 cents worth

[mlinder]

It's amazing what proper tire pressure can do when traveling over bridges and cracks....

[Inigo Montoya]

Well mlinder, you can always try it. I am sure we have ALL spent over $15 on things with less worth!
if it doesnt work, remove them. if it does, well at least you know.

[mlinder]

Well mlinder, you can always try it. I am sure we have ALL spent over $15 on things with less worth!
if it doesnt work, remove them. if it does, well at least you know.

I could. 'Course, none of my bikes run at the moment, and when they have, they were always balanced correctly..... :/

[Markcb750]

I am calling Click and Clack, from Car Talk every Saturday morning until I get them to answer this one. ( I know they attended MIT, they must know) 

[IHWillys]

Centramatic balancers are a similar product atleast in what it is purported to do and how it does this.

http://www.centramatic.com/techfacts.html

Ken

[mlinder]

Why the hell can't I scroll down on that page? I wonder if it's some stupid linux problem....

But, they have very good animated real-time diagnostics that prove their product works!


UNBALANCED WHEEL


BALANCED WHEEL

I'm fackin sold!

[Frankenkit]

*sigh* they could do *better*...

[mlinder]

*sigh* they could do *better*...

What do you mean? That's very convincing.