Dyna Beads. Dynamic Balance beads.

[mdr]

I did a custom Royal Star about 5 years ago. I put some rims oin that had mercury in them and did the same thing. The mercury would automatically balance the wheel when moving.

OMG. You do (I hope) know that mercury can be exceedingly dangerous... Some countries are banning it entirely. It's nasty stuff.

PS: If I recall correctly its EXTREMELY corrosive to aluminum. Not overstated.

Here some quotes from Wiki:

Mercury readily combines with aluminium to form a mercury-aluminum amalgam when the two pure metals come into contact. However, when the amalgam is exposed to air, the aluminium oxidizes, leaving behind mercury. The oxide flakes away, exposing more mercury amalgam, which repeats the process. This process continues until the supply of amalgam is exhausted, and since it releases mercury, a small amount of mercury can “eat through” a large amount of aluminium over time, by progressively forming amalgam and relinquishing the aluminium as oxide.

Aluminium in air is ordinarily protected by a molecule-thin layer of its own oxide, which is not porous to oxygen. Mercury coming into contact with this oxide does no harm. However, if any elemental aluminium is exposed (even by a recent scratch), the mercury may combine with it, starting the process described above, and potentially damaging a large part of the aluminium before it finally ends.[48]

For this reason, restrictions are placed on the use and handling of mercury in proximity with aluminium. In particular, mercury is not allowed aboard aircraft under most circumstances because of the risk of it forming amalgam with exposed aluminium parts in the aircraft.

 

[Maverick]

I know a guy who installs his own tires and never balances the tires at all and claims to never have an issue... anyone else not balance their tires??

 

[wrightme43]

Not me. My rear has 3 oz of balance wieghts on it.