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Chain skipping in 5 & 6 gear. Is this worn?

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Chain skipping in 5 & 6 gear. Is this worn?

Old 01-14-23, 10:26 AM
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Chain skipping in 5 & 6 gear. Is this worn?

I have a 6 speed bike that was skipping in 5th occasionally, so checked the chain and it was worn beyond 0.75%. I replaced it and now it skips even more in 5th and 6th under load.

Do the rear cogs look worn out enough to make that happen?

Does the rear derailleur look like it's pulling up high enough? maybe a weak sping in that too?

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Old 01-14-23, 11:04 AM
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Time for a new freewheel. The amount of wear needed to make it skip can be pretty subtle.
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Old 01-14-23, 11:07 AM
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Freewheels are too cheap to worry about- Replace it.
And yes to your question. The unworn chain is a greater mismatch to your worn cogs than a worn chain.
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Old 01-14-23, 01:14 PM
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Yeah get a new freewheel generally when you replace chain especially a heavily worn chain you want to replace freewheels, cogs, or cassettes depending on what you have. Also that derailleur probably isn't helping much either it is probably one of the cheapest Shimano branded derailleurs. I probably wouldn't replace it but just look at a different bike
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Old 01-14-23, 05:40 PM
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This has happened to me many times. And I think the problem is caused by the new chain ( with its unworn pin to pin spacing ) being pulled down deeper into the worn sprocket under pedaling load, which has a different "tooth to tooth" spacing due to wear.

If you want to ascertain in future how wear on your sprocket teeth is progressing, I have recently found this tool ( the "HG Check" ) works great :


It says for Shimano ( i.e. hyperglide ) sprockets, but I can't see why it wouldn't work for all sprockets of standard bicycle chain pitch.
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Old 01-14-23, 06:28 PM
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Yes, as others said, you need a new freewheel. Get it soon, before this chain stretches to match those worn cogs or your newly worn chain will quickly take down your new freewheel.

Or better, replace both. Keep this one as a working spare. Now, watch that new chain carefully. Replace it early. Doing this, you may get the freewheel to last several chains. (You might want to adjust your riding and gear choices to use the other cogs more to both even out the wear and spend more time with the chain on bigger cogs which is far kinder to the chain.)

Edit - the wear it take to make a cog a poor fit for a new chain cannot be seen. (If you can see tooth wear, that freewheel or cassette will only run with chains that were beyond stretched long ago.)

Last edited by 79pmooney; 01-14-23 at 06:34 PM.
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