Shimmy is not related to frame alignment, but rather to harmonic oscillation. In fact a well aligned frame is more p
1) Pinch the top tube with the knees. (Damps out the oscillations.)
2) If seated, stand. If standing, sit. (Changes the anchor about which the system oscillates.)
The whole system is involved (bike + rider). Since the whole system is involved, changing *anything* might help. We recommend:
1) Move the saddle fore or aft 1/4 of an inch. (One can always change the stem to compensate for the change in position).
2) Change some other component. Most will have some component the rider will want to change anyway, perhaps a new stem. Larger tires may also help; change f
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