Agree, more unsprung weight is bad for multiple reasons. I wonder if it would stick and move with the tire or be more fluid allowing it to keep a tire in balance though it's life? If it stayed more fluid would centifugal forces keep it in place or would it slosh around under braking and acceleration causing an out of balance situation? Could it set up an undesirable harmonic? Could these things upset handling as I believe current linked ABS's can when trail-braking? Would it help heat or cool the tire (it would seem to increase a tires heat-sink)? I think that this stuff would be heavier than weights properly setup overall and that that weight would have a greater arm causing increased gyroscopic effect.