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Altus clunking while grinding hills

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Altus clunking while grinding hills

Old 09-24-18, 03:33 PM
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RC71
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Altus clunking while grinding hills

My wife and I have nearly matching Cannondale Quick Hybrids using Shimano Altus 9 speed rear derailleurs with a front triple.


She has maybe 500 miles on hers and I've logged 5,792 miles on Bike Journal. I have two crashes both had a derailleur impact, one hit the ground and one got smacked by my ankle stripping the cable out of the clamp. Both are 6 months to a year ago.


I installed a new KMC X9.93 Nickel black 9-speed chain Friday and the checkout seemed fine but when I went out the club 26 miler Saturday it was clunking. Somehow it was slipping then catching again when I would grind up a steep short levy ramp.


Comparing the feel of the mounts and pivots of the two derailleurs both are tight at the hanger pivot and move smoothly. But at the next joint mine feels loose and hers does not. I can imagine it allowing enough motion to convince the chain to start a shift as it flexes under load. I have not tried cranking the bike on my work stand while trying to wiggle the loose joint.


I plan on riding on Tuesday, Thursday, and Saturday. Tuesday there no need to grind but there 1360 in climbing.


Is there a set of pivots I can tighten? Or is this crash damage and I'm in the market for a replacement part or an entire new derailleur?


Thanks,
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Old 09-24-18, 03:43 PM
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Andrew R Stewart 
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First thought is that your cog set is also worn to enough degree so a new chain won't mesh with it under pressure without complaint. Second thought is that the index adjustment is off and the chain is trying to shift when you don't want it. The solution might be simple. Try a new cog set and readjust the rear der to suit.

Der pivots usually don't see side forces unless one is shifting. So their slop is generally taken up in one direction by the by der parallelogram's return spring.

Last thought is to check your guide pulley for rocking slop. This is different then the designed in end play. Andy
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Old 09-24-18, 04:43 PM
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My money is on a worn cassette and the new chain is slipping under heavy load.
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Old 11-04-18, 11:52 PM
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Agree with you
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