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Rear derailleur movement on hanger

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Rear derailleur movement on hanger

Old 06-30-21, 12:34 PM
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There is an old surgical maxim on futile repair," You can't sew snot."

I have acquired a "low mileage" Cannondale Quick 9 speed with a Shimano Acera RD with less play than the above vid, but BIG clunk between 4 and 5 under load when riding. (12/-32 Shimano cassette)
Hard to visualize and I can't repeat it on the stand.
Replaced with new Shimano chain, checked drop out alignment and torqued attachments, cassette looks good on close inspection, but not been substituted or replaced. No measurable wear or damage.

Hanger bolt slop gives about 4mm play , measured from a spoke to the leading edge of the upper jockey wheel in affected gears
Comparable checks on other derailleurs seem to have much less play, and again this only has problems under load not during shifting , which is smooth.

My question is
Can that hanger bolt to derailleur body play be addressed or is it just a sloppy manufacturing tolerance and needs to be replaced as the next step?

Last edited by bikebikebike; 06-30-21 at 12:42 PM.
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