marchyman
Cam Killer
Actually IMHO - that's a good test. The "spin balancer" actually measures displacement forces on the center axle going through the mounted wheel. It does this when the wheel is MOVING - not when it's stationary.
Beads need suspension movement, not the forces that would generate that movement, to have a chance at working. The beads DO NOT BALANCE THE WHEEL. They may balance the effects that an out of balance wheel have on a moving suspension by changing the the coupled mass of the wheel.
An out of balance wheel will tend to compress the suspension as the heavy point is in line with the spring. When it does this the tire, for a brief bit, moves away from the beads that are at the top of the arc. For that brief bit the beads at the bottom are coupled to the wheel but the beads at the top are not. The mass changes. That's the theory as I understand it. I think I see how it can work. But....
- how fast does the wheel need to spin?
- how much suspension movement is needed?
- what effect has suspension movement not associated with an out of balance wheel?
- how well/fast to the beads react to varying wheel speeds?
- what, if anything, do beads do to the inside of your tire?
- since the wheel is not balanced, is there extra wear on wheel bearings?
Those are a few of the unanswered questions that keep me from using beads.