tire balance

[Charlie Horse]

Got a question for anyone with experience using Dynabeads in their tires. I just mounted a new set of PR4's on the bike. I seem to have a rumble at very high speeds that I didn't have before. Feels like the whole bike is shaking...not the steering. I'm trying to figure out if I just need to add a little more or what. I put 2 oz in front and 2 oz in the rear. Any opinions? TIA

 

[MrZappo]

Take those things out and balance it the old fashioned way .. Or add till it stops ...

2oz seems a bit light to me ...

 

[HotRodZilla]

What Zappo said...The part about taking them out, not the part about adding more. After removal, balance your wheels correctly. Life should be good again.

 

[Fred W]

If you add enough beads you don't need to put air in them.

I read it on the intarwebs, so it has to be true.

I'm posting this smart-*** comment because I know this will be moved to NEPRT in 3, 2, 1...

 

[wheatonFJR]

If you run outta dynabeads, just throw some gravel in there. Same concept...costs less.

 

[art miller]

Charlie Horse,

You put to much in the front tire. For tires up to 120 width you are to use 1oz. For the rear tire you are correct with 2oz. I have been using dyna beads in my front tires for a number of years and never a balance issue. I have been running PR2's. It is important not to get bead lube on the inner part of the tire as the beads will stick to it and cause a heavy spot. I suggest you remove the front tire and get down to 1oz of beads and make sure the tire is dry on the inside surface. If you still get sharking it may be the rear tire is wet on the inside and beads are stuck in place.

 

[Fred W]

Wait, why would having too many beads in there be a problem. I mean, if they worked at all that is.

 

[art miller]

I do not know the technical reason however I guess if too many beads they will create a heavy spot kinda like too much weight will wheel weights.

 

[ionbeam]

Guess Be Gone

Made by Forum member and Mechanical Engineer FJReady with improvements over the Parnes balancer.

In what way are beads better than an actual balance job?

When you are stopped, where are the beads? When you start moving where do the beads go? How fast do you need to be going before they go to the G-Spot? Since the beads are round and roll inside the tire, why would they want to move to the light spot of the tire and then just stay there?

(Don't make me have to put the airplane on the conveyer...)

 

[mikerider]

Saw this link the other day:

https://www.physicsforums.com/threads/cannot-find-any-scientific-validation-of-product-dyna-beads-for-tire-balancing.637080/

 

[Auburn]

IF dyna beads were the cats meow, you would see them used on every MotoGP bike and roadracer world wide. They still do it the old tried and true method of static balancing with stick on weights. That is good enough for well over 200 mph. After you see what dyna beads does to the inside of a tire carcass I doubt you will ever use them again.

NEPERT 3, 2, 1 as discussed many many times there.

 

[wheatonFJR]

Guess Be Gone
Made by Forum member and Mechanical Engineer FJReady with improvements over the Parnes balancer.

In what way are beads better than an actual balance job?

When you are stopped, where are the beads? When you start moving where do the beads go? How fast do you need to be going before they go to the G-Spot? Since the beads are round and roll inside the tire, why would they want to move to the light spot of the tire and then just stay there?

(Don't make me have to put the airplane on the conveyer...)

 

[art miller]

I've read this thread, earlier threads, and the Physics Forum comments and simply say, dyna beads seem to work in my front tires. I have no noticeable vibration or wobble. I have also observed the interior of all the PR2 tires after going thru tire life and there is no damage. I mentioned earlier it is important to not get bead lube on the inner surface. We have worked this topic to death. It has worked for me and until I find it no longer works I will ride on without lead hanging on my shinny black wheels.

 

[RaYzerman19]

OK if I weigh in on beads then weigh out, does that make me neutral or still out of balance?

 

[HotRodZilla]

Well, it means you haven't gained any weight. Which is good, except you haven't lost any either. It's all very complicated.

 

[Redfish Hunter]

Well, it means you haven't gained any weight. Which is good, except you haven't lost any either. It's all very complicated.

It must be complicated because I still have no idea how those things are supposed to work.

 

[Charlie Horse]

Here is the theory...

www.innovativebalancing.com/HowItWorks.htm

It usually works very well....I'm trying to diagnose why I have an issue now. Too much or too little. Only an electronic balancer can tell me.

 

[wheatonFJR]

Because if it's electronic, it's gotta be more accurate.

 

[DeSudet]

I prefer mine to be hormone, gluten, antibiotic, GMO and Oxford comma free.