Please do not assume that when your tyre has been dynamically balanced
that you have necessarily eliminated all potential causes of vibration.
Should the tyre be out of round, flat spoted etc. or as has happened to
me with a new wheel the rim ( not spokes) had not been manufactured
correctly, the wheel/ tyre can have weights added to compensate for the
dynamic forces generated by the out of true. BUT when you return the
assembly to run on the radius of the tyre/wheel any dimensional error
and out of tolerence will cause the wheel to rise and fall each time
that point comes in contact with the road surface. Additionally a
defective tyre may appear true at the low speeds used to dynamically
balance them but at speeed and with heat it can deform to an out of
round state. The join in the tread is often the point at where the
dimensional accuracy fails. Thus balanced on a free standing axle or
machine shaft is no guarantee of NO SHAKES
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