Modern Vespa

We have been using dyna balls in our shop with great success.
(stainless steel poppy sized beads weighted in 1/2 oz increments that go inside the tire or even an inner tube)
Dyna balls have replaced the tradition weighted wheel balance technics.
We're wondering if anyone else has had positve results with this or a similar product.

news to me..... is it really that effective?

I've used Dynabeads - small ceramic beads with great success. I've posted to a couple of different threads here about them. I liked them so much I sold my Mark Parness balancer as I doubt I'll ever go back to standard lead wheel weights - which apparently are going to be on the endangered species list soon due to government environmental legislation.

Dave

Same here, never used the Parnes, but someone got a great deal...oops I mean....

+1

it's been discussed a TON. I know I started a thread a year or so ago on the topic. At this point I think it's 50/50. I never went with them but the people who have tried them think they're amazing.

whats the effect?

+1 on the DynaBeads. I read somewhere that some RV companies are including them from the factory.

I thought the big ones were for Semi's, RVs and Busses.

Just wondering whether a plug would interfere with their distribution inside the tire.

I do alot of tire work and there are alot of tricks with the internal tire balance idea. In larger truck tires you can use three golf balls. In smaller tires some guys use anti-freeze, [about a cup or more depending on tire size].
It all works through the same principle. But the balancing only starts at about 30 mph or so. Under that no real effect.

now comes all the comments about how it's dangerous to plug scooter tires!

just curious, why antifreeze?

Liquid will work in the same way as balls, sand or any other internal weight. You could use regular water but might have a problem when the weather gets below freezing.

so you not talking about them things our lass has on string in her pants drawer then

I almost bought those dynabeads but opted for Ultraseal instead. The Ultraseal seals punctures and helps in the balancing too since it's a liquid you install thru the valve.

Dynaballs used to be the steroid of the sixties before we knew
what we were doing. I was too lazy to exercize so only used a
one month supply - but they were round, maybe i inserted them
wrong.
jim

I think it might depend on the type of plug... If you use the Stop 'N Go type I'd say there would be no problem. The regular old snotty brown worm covered in glue type may not be a compatible as they may tend to stick to it...


Stop 'N Go plug:



Snotty Brown Worm:



Dave

They might work. You should try them out personally and let us know... try them out in your tires, I mean. Do you think your girl would mind?

Would someone with a grounding in physics please explain the principle on which these might work? I consider myself reasonably sharp in such things, but I can't for the life of me figure out what physical force would cause the beads to distribute themselves proportionally in such a way as to dynamically balance the wheel.

In the absence of a well-reasoned explanation, I remain a skeptic.

Have you looked at the web site? http://www.innovativebalancing.com

Dave

I see their explanation, but the physics don't compute for me. For example, they claim that the balls are held in the balanced position by centripetal force. If one understands centripetal force, it is clear that force exerts no control of where the balls locate nor any force to hold them there in a wheel of uniform radius.

Further, their explanation totally ignores the fact that tires flatten out on the bottom where they contact the road. Surely that affects the distribution of the beads.

No experience with any of these dynamic balancers; but, I do find it strange that there are no applications for automobiles - the most common vehicle we are all familiar with.

Must admit I agree with you - I can't see how it would help. If it's a liquid then it should just get smeared evenly across the inside of the tyre. Perhaps it has something to do with the vibration caused by any imbalance that might channel the liquid to the right spot - can't see how it would though.

I guess putting a wheel onto a wheel balancing machine and seeing whether the liquid fixes any imbalance would be a reasonable proof though.

Green slime has the same effect and seals leaks as well.