Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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All freewheels and cassettes wobble to a degree, and that normal amount of wobble doesn't affect shifting.
The wobble happens because the inner part of the freehub body isn't perfectly aligned with the rotating axis of the hub it's attached to. So when the hub spins the freewheel (or cassette) oscillates (wobbles).
If the wobble is more than 1mm or so at the largest sprocket, than it's possible that the freehub body is coming loose from the hub shell, especially if it's worse now than it used to be. (if you never noticed the wobble, you don't have a base line for comparison).
If in doubt bring the wheel only into the local shop ad ask the mechanic to confirm if the wobble is within normal range. Once you've answered that question, you'll be better equipped to solve the shifting question.
An ounce of diagnosis is worth a pound of cure.
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