Measuring chain wear

[papalimafoxtrot]

Hi my entry level 10 speed Shimano chain shows 0.7% wear using a reputable chain gauge tool but when using a ruler no perceptible elongation is indicated (and I am quite capable of judging 16th-in. by eye!).Both methods of measurement are variously recommended on line but there is an obvious contradiction here. I suppose the tool measures wear on rollers and pins but the ruler shows pin wear only - which parameter should dictate when to change the chain? Chain “lift” off the front of the chain wheel is minimal. Should I change the chain soon?. Apologies if this topic has been covered before but I am a new member and could not find this topic in the archive.

[rjb]

Here you go - a bit of light reading from the master.
viewtopic.php?t=115336

[Jdsk]

Welcome.

viewtopic.php?f=5&t=115336
viewtopic.php?t=142494

I use a Pedro Chain Checker II.

Jonathan
Edited: Crossed post.

[papalimafoxtrot]

Thank you - “can of worms” comes to mind….

[keyboardmonkey]

Change it now. And change the next one at 0.5% wear.

[531colin]

The important thing is to bin the chain before the chain is too worn.
Leave it too long and the cassette wears so the tooth profile matches the worn chain, and a new chain will then "skip" on the worn cassette.
If you change the chain regularly, you can get a very long useful life out of cassettes and chainrings. viewtopic.php?t=116834&hilit=reverse+we ... e&start=45
Exactly what "too worn" is may depend on how you ride....a powerful rider who pushes hard on small sprockets might get a different answer to a rider who pedals at high cadence using low gears.

[esasjl]

Some info here
http://pardo.net/bike/pic/fail-004/000.html
Park CC4 should be reasonably accurate.
https://www.parktool.com/en-int/product ... gory=Chain

[markjohnobrien]

Welcome.

viewtopic.php?f=5&t=115336
viewtopic.php?t=142494

I use a Pedro Chain Checker II.

Jonathan
Edited: Crossed post.

Just reread some of these posts - wonderfully informative and great expert knowledge.