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Wobbling Cassette? What did I do wrong here?

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Wobbling Cassette? What did I do wrong here?

Old 07-25-22, 09:28 AM
  #1  
Bzakes2375
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Wobbling Cassette? What did I do wrong here?

I took my chain off last night and did a deep clean in my parts washer as I have some new high quality chain lubricant to put on. When I put the chain back on, I can't get the rear derailleur to adjust properly, and I noticed when I let the wheel spin the rear cassette has a noticeable wobble. I gave up trying to adjust the derailleur when a huge horse fly flew into my garage, I'll head out in a bit to try again. In the meantime, I don't think its supposed to do that, correct?

It won't let me link a video as I have fewer than 10 posts. I may be able to PM the link to those interested?
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Old 07-25-22, 09:33 AM
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I’m assuming you took your cassette off and reinstalled it? I’m assuming you have a cassette and not a freewheel here. Are all the original spacers in the same locations? Did you torque the hyperglide lock ring? These are things I would check.
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Old 07-25-22, 09:40 AM
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I took the wheel off to give it a quick wipe down since the chain was off, I didn't touch the cassette at all, it stayed on the wheel as it was. I don't have the right tool to work on the hyperglide lock ring. Just checked, it is a cassette.
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Old 07-25-22, 11:31 AM
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This is probably caused by a bent axle or a bearing not fully seated.
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Old 07-25-22, 01:07 PM
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A cassette or free wheel may have a SLIGHT wobble to it. That's normal. Parts tolerances.
Check a couple other bikes and compare.
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Old 07-25-22, 01:43 PM
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What sort of wobble is it? Like from the side the cogs are not spinning quite on center? Or when viewed from the rear the cogs are oscillating side to side? Also give us an idea of how much it is. Like the thickness of a business card or something more or less?

Is it actually loose and wobbly or is it firmly in place but has runout when spun? If it's a freehub and if the whole thing is free wobbling then it might be the hollow tubular "bolt" that secures the freehub to the wheel hub that has come loose. And that compounds things and will also show up as a wobbly wheel since the drive side bearing cup for the axle is part of the freehub. Look at an exploded parts diagram if not sure.
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Old 07-25-22, 01:48 PM
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Those horseflies are known to cause all sorts of problems with bike cassettes.
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Old 07-25-22, 01:52 PM
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If you upload a video of the issue to YouTube or similar and post the title+username Iíll put a link here for you.
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Old 07-25-22, 01:59 PM
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Sounds like a bent axle. You should take your bike to the shop.
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Old 07-25-22, 03:57 PM
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I would NOT expect a bent axle to have any effect on a cassette wobble.
The axle doesn't rotate!
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Old 07-25-22, 07:49 PM
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Could there have been any sideways torque on the derailleur when the wheel was off, or when you were working on the chain? If so, the hanger might be bent. That'll throw off the limits and the shifting, and it's nearly impossible to see without a precision gauge.

Many cassettes wobble a little. It's doubtful you did anything to cause that.
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