Chain droping

jamesn184
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Chain droping

Postby jamesn184 » Sun Jan 21, 2018 7:28 pm

Hi All,

I started to suffer chain dropping whilst on the small chain ring and getting out of the saddle to climb up a hill.

I have replaced my chain and cassette, but still have the same issue.. the only difference I noticed was it wasn't as clunky.. you could sorta feel that I had to replace the chain towards the end..

The only thing I can think of next is maybe my chain rings?
I'm not sure on how many km's I've actually done on them either
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Trevtassie
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Re: Chain droping

Postby Trevtassie » Sun Jan 21, 2018 8:37 pm

With the chain on, try lifting the chain off the chainring at the front in the middle of the wrapped section. If you can get it high enough that you can see the tips of the teeth under the chain, it's definitely a buggered chain ring!

jackthelad
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Re: Chain droping

Postby jackthelad » Sun Jan 21, 2018 11:24 pm

what he said,
or just single ring it, its the way forward
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hamishm
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Re: Chain droping

Postby hamishm » Mon Jan 22, 2018 10:57 am

If your front derailleur limits are set properly you shouldn't be able to drop the chain off the small ring?

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CKinnard
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Re: Chain droping

Postby CKinnard » Mon Jan 22, 2018 11:15 am

consider your fd limit screws and chainring bolts.
then consider how many k's your chainrings have done. they should be good for at least 20,000 if you have maintained the bike well.
finally, check the frame for cracks that might be flexing it excessively with the extra load of climbing. frame flex distorts the chainring's alignment with the chain.

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Duck!
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Re: Chain droping

Postby Duck! » Mon Jan 22, 2018 11:24 am

Check the ring wear first. Especially if the only things that have been changed recently are the chain & cassette.
I had a thought, but it got run over as it crossed my mind.

jamesn184
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Re: Chain droping

Postby jamesn184 » Tue Jan 23, 2018 2:02 pm

I don't think the chain rings have done 20k km's.. they were bought off one of the members here a few years ago.
I can nurse it over a hill most times if I stay seated on the saddle.. It's only when I get out of the saddle it will result in a dropped chain pretty much straight away.. only when in the small ring tho..

Not going to be cheap to source chain rings either -_-

I did the chain test.. the links separate but not by much
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eeksll
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Re: Chain droping

Postby eeksll » Tue Jan 23, 2018 5:41 pm

small rings are relatively cheap.

I assume you have adjusted with the limit screws on the front derailleur.

Edit: and the FD isnt too high.

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ColinOldnCranky
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Re: Chain droping

Postby ColinOldnCranky » Tue Jan 23, 2018 9:08 pm

Hmmm. You have new chain AND cluster. The common cauuse is to replace a chain but retain the cluster but it appears that you have done it right. :|
Unchain yourself-Ride a unicycle
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Duck!
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Re: Chain droping

Postby Duck! » Tue Jan 23, 2018 10:34 pm

I repeat: Worn ring/s.
I had a thought, but it got run over as it crossed my mind.

headasunder
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Re: Chain droping

Postby headasunder » Thu Jan 25, 2018 9:43 am

Duck! wrote:I repeat: Worn ring/s.

This

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CKinnard
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Re: Chain droping

Postby CKinnard » Thu Jan 25, 2018 10:41 am

how about you post a pic of the offending ring.

you can't determine the km's in the chain if you bought them used.
the only ambiguity is more often the larger chainring wears quicker than the inner.
however, if the person you bought the bike from did a lot of hills, and/or was heavier than average, or had some other reason for riding more in lower gears, that could explain faster inner wear.
what brand are the chainrings? some are made from softer metal.

Kronos
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Re: Chain droping

Postby Kronos » Mon Jan 29, 2018 11:51 pm

In the short term be more sympathetic on your gear shifts and lift off a little before you change gears. In the long term you might need a new chainring and chain. These are the usual culprits. I've only ever been generally responsible for dropping a chain when I've shifted like a gorilla.

jamesn184
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Re: Chain droping

Postby jamesn184 » Sun Feb 04, 2018 1:50 pm

Kronos wrote:In the short term be more sympathetic on your gear shifts and lift off a little before you change gears. In the long term you might need a new chainring and chain. These are the usual culprits. I've only ever been generally responsible for dropping a chain when I've shifted like a gorilla.



It doesn't drop when I shift.. only when I start climbing a steep hill.. and usually when I am out of the saddle..

Ill take some pictures tomorrow of the chainrings.. but I think they have done around 10,000km or less
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CKinnard
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Re: Chain droping

Postby CKinnard » Sun Feb 04, 2018 2:03 pm

to what side does the chain drop to - towards the frame or the large chainring?

and what rear gear do you think you are in when you get out of the saddle to climb when this happens? the middle 4 or 5 rings, the outer (smaller) 3, or inner 3.

jamesn184
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Re: Chain droping

Postby jamesn184 » Sun Feb 04, 2018 5:59 pm

CKinnard wrote:to what side does the chain drop to - towards the frame or the large chainring?

and what rear gear do you think you are in when you get out of the saddle to climb when this happens? the middle 4 or 5 rings, the outer (smaller) 3, or inner 3.


drops off the small ring onto the towards the frame and always in the lower gears 1 to 3
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CKinnard
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Re: Chain droping

Postby CKinnard » Sun Feb 04, 2018 9:27 pm

jamesn184 wrote:drops off the small ring onto the towards the frame and always in the lower gears 1 to 3


btw, I just want to confirm because you haven't specifically said yet, you are talking about a road bike with two chainrings, not a touring or mountain bike with a triple chainring.

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