He said it was a long shot as they never get very good results from it..... and it was crap.
In the end they just did a best guess with stick on weights and got better balance than from the powder.
I came across this company's products by chance on Ebay.
http://www.dynabeads.co.uk
The product consists of small ceramic beads (less than 1mm in diameter) that are inserted into a tyre to provide a self regulating balancing medium.
When stationary the beads are in a heap at the bottom of the tyre and as speed increases the beads distribute themselves around the tyre under the
influence of centrifugal force and the cyclical influence of imbalance forces. A tyre not requiring any balance correction would have the beads
uniformly distributed around the tyre circumference. In a tyre needing balance correction the beads would take up positions that counteract the out of
balance forces.
The mass of beads needed increases with the size of tyre. A 185/ 13 tyre needs 60 grams of beads.
A 60 gm sachet costs £10 plus vat, giving a bill of £47 for 4 wheels - quite expensive.
However, a single 360 gm sachet including vat is much cheaper at £15.59
The beads are re-usable, so a second set of tyres would only need replacement of the inevitable lost medium.
The beads can also be added to the tyre via the valve, with the core removed.
Does anyone have any knowledge or experience of this balancing method?
Cheers,
Mal
Old idea but usually not actuall inside the tyre for very obvious reasons.
Was talking to someone recently who was at my favourite MOT garage
getting some fitted to the mahoosive tyres on his Disco. Will find out
how he got on and report back.
I had a peugeot a few years back that had solid centres on the wheels (ie where a badge normally pushed in it was solid) well, this makes them not fit
on most tyre balancing machines, so my local tyre fitters suggested they use powder balancing. Similar to the beads I guess, but a lot finer.
He said it was a long shot as they never get very good results from it..... and it was crap.
In the end they just did a best guess with stick on weights and got better balance than from the powder.
Interesting product.
I bought a set of e-bay wheels (4 spoke revolutions, which are my favourite wheels) with tyres on, balance was dreadful so I paid to get them
balanced, the kwik fit guy used up about 200grammes per wheel and said they were the worst wheels he had ever seen (he was only about 12 but either
way not so good).
Balance still rubbish, vibration all over the place.
Tyres were old (like 8 years and a bit crappy) so I hoped it was the tyres and got some new tyres fitted, turned out the tyres have a load of red
lumpy fluid inside. Probably some kind of sealant. Who knows, classic e-bay experience.
Wheels are great now.
Anyway, to my mind the fluid isn't really any different to these beads. I can't see it working.
Matt
quote:
Originally posted by balidey
I had a peugeot a few years back that had solid centres on the wheels (ie where a badge normally pushed in it was solid) well, this makes them not fit on most tyre balancing machines...
yep, those were the wheels. Local pug dealer sent me to the tyre fitter and said they know how to do them.... turns out it was the powder. They didn't bother getting any adaptors
My interest in the beads is because I am in the process of making a manual tyre changer, to allow me to get the best financial benefit from buying
tyres online.
If I can also balance the wheels I can have complete control over the process and avoid the problems caused by some of the less caring members of the
retail tyre trade.
Do they still produce the spirit level type balancer, havent seen one for a while
For DIY balanging I think I'd sooner put the money towards something like THIS
What happens when you brake or accelerate - does the tyre go out of balance as the beads continue to spin round at the original wheel speed - would be interesting braking heavily from high speed if you had a bad imbalance.
Having read all th blurb, i would say "snake oil"
"Why don't you have tyre charts for cars or SUV's?
We do not market to cars and SUV’s intentionally.
The main reason (among others) is due to the style of modern car tyres.
For cars and SUV’s, traditional weight balancing is the best method."
Also
"
Can I put the tyre on a balancer to see if it's working?
No. Dyna Beads operates on physics principles, and requires the tyre assembly to be in motion against a road surface to detect the exact
counterbalance position. An electronic balancer has a solid, fixed mount, and does not allow the tyre to react to imbalance."
^^^^ got me thinking - surely the deformation at the contact point which must be 1 to 2 cm at least would shoot the beads in the "air" upsetting the balance as well and not really giving them time to settle on the circumference - as said above, sounds like snake oil.
Load of old cobblers I think!
get a used tyre balancer!
Static balancing is also crap, it needs to be dynamic to be any use really
Absolute tosh, almost as bad as rocks in the tank, magnets on the fuel lines, hydrogen generators and computer fan 'electric turbos'.
Potentially dangerous becuse of the effects on the tyre carcass but not tosh the theory is sound, a workable version was demonstrated in the 1960s/70s on tomorrows World it took the form of an anular tube with ball bearings in it that bolted to the wheel hub.
quote:
Originally posted by NS Dev
Load of old cobblers I think!
get a used tyre balancer!
Static balancing is also crap, it needs to be dynamic to be any use really
I found the beads while looking on Ebay for a second hand conventional balancer, but have some
concerns about the cost effectiveness of buying one unless lucky enough to find a bargain.
The static balance spirit level type that someone gave a link to Frost's website for appear in great
numbers on Ebay.
Mal
an old track trick was to put a small amount of water in the tyre
this acts like a fluid damper for big crankshaft dampers like the 15l diesels i work on just a donut shape hole with some oil in (made of steel and
sealed )
quote:
Originally posted by baz-R
an old track trick was to put a small amount of water in the tyre
this acts like a fluid damper for big crankshaft dampers like the 15l diesels i work on just a donut shape hole with some oil in (made of steel and sealed )