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Slipping chain from rear derailleur/cassette Bianchi

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Slipping chain from rear derailleur/cassette Bianchi

Old 07-08-20, 10:46 AM
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sdia313
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Slipping chain from rear derailleur/cassette Bianchi

I just purchased a Bianchi Veloce with a Campagnolo 9 Speed Derailleur and I took it out on its first ride today. About 20 kms in the chain began to skip. Upon further inspection, I found that the chain was coming off of the rear derailleur/cassette.This was happening on every gear and it kept happening on the same chain links on every revolution.

As I am new to cycling, I did not know what was causing the issue. I readjusted the barrel adjuster and the H limits and that didnít resolve the issue. I was wondering if this was a chain issue, derailleur issue or something else? The chain does not seem to be worn but I do not have the proper tool to test. Instead I watched a video that said the center of the two chain links should be 12 inches apart which mine is or maybe 1/16 less. Iíll attach pictures below. I tried attaching a video I could not do so. But the video can be found on red dit via user name sdia313

Would love to know the issue for my own knowledge and to know what I need to have it fixed. Thank you!





Last edited by sdia313; 07-08-20 at 12:11 PM.
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Old 07-08-20, 11:28 AM
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aggiegrads
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Looking at KMC chains, most that are marked "Z" are 6, 7, and 8 speed chains. Most of the 8-speed chains are marked "narrow" on the links.

My guess is that you have a 7 speed chain on your bike.
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Old 07-08-20, 11:37 AM
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Originally Posted by aggiegrads View Post
Looking at KMC chains, most that are marked "Z" are 6, 7, and 8 speed chains. Most of the 8-speed chains are marked "narrow" on the links.

My guess is that you have a 7 speed chain on your bike.
so do you think all it needs is a change in chains to a 9 speed chain?
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Old 07-08-20, 11:46 AM
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If you have a way to measure the chain, that would be the best path forward. If you have a set of calipers, the measurement over the pins should be 7.0mm or less.

If you don't have a set of calipers, you could use a 7mm open ended wrench as a go-no-go gauge.
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Old 07-08-20, 02:14 PM
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A worn chain and/or cassette will do just that

Chain stretch gauges are cheap enough, you should buy one. Chains themselves are cheap enough to just replace. Not a bad idea with a used bike..If it still does that with a new chain than the gears on the cassette are worn.
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Old 07-09-20, 12:35 PM
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Is that a tight link I see?

Cheers
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Old 07-09-20, 01:03 PM
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Originally Posted by Miele Man View Post
Is that a tight link I see?

Cheers
You might be right. It looks a the chain is lifting in a consistent manner. I would mark the link where the problem is happening and see if it does again in the same place.

I have a purple sharpie for this king of marking.
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Old 07-09-20, 02:07 PM
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Originally Posted by sdia313 View Post
so do you think all it needs is a change in chains to a 9 speed chain?
Originally Posted by aggiegrads View Post
Looking at KMC chains, most that are marked "Z" are 6, 7, and 8 speed chains. Most of the 8-speed chains are marked "narrow" on the links.

My guess is that you have a 7 speed chain on your bike.
Hint....Hint... OMG... KMC does not make 9 sp Z chains. Hint.... Hint.
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Old 07-09-20, 02:41 PM
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"kept happening on the same chain links on every revolution." Suggests stiff links. You can try to loosen or maybe the chain is due for replacement anyway.
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Old 07-10-20, 12:01 PM
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Originally Posted by trailangel View Post
Hint....Hint... OMG... KMC does not make 9 sp Z chains. Hint.... Hint.

The chain was a KMC Z9
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Old 07-10-20, 12:03 PM
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Originally Posted by Miele Man View Post
Is that a tight link I see?

Cheers
Thank you because yes it was. Couldnít loosen the link so just replaced the chain as it was a secondhand bike anyways. Riding smoothly.

cheers! thanks all for your help!
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Old 07-10-20, 12:16 PM
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Originally Posted by sdia313 View Post
Thank you because yes it was. Couldnít loosen the link so just replaced the chain as it was a secondhand bike anyways. Riding smoothly.

cheers! thanks all for your help!
I'm so glad we were able to help you solve that problem.

May the wind be always at your back and may your flat tires be few.

Cheers
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