Chain jamming into chainstay

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Chunkers1980
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Re: Chain jamming into chainstay

Postby Chunkers1980 » Mon Sep 24, 2012 19:17 pm

Yes but the picture the OP has shown has nothing to do with clearance. It is sucked, knowing it happens by marks is frame specific, it happening has nothing to do with the frame, chain line and stay length/angle apart, but even that will vary depending on what gear you're in.

paulneenan76
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Re: Chain jamming into chainstay

Postby paulneenan76 » Mon Sep 24, 2012 22:37 pm

This may be stating he bleeding obvious but could the people at On One shed any light on this???

I'm doing a frame swap to a C456 soon and chainsuck outside of the norm will not make me a happy bunny ;D
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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Tue Sep 25, 2012 04:19 am

I guess cable ties located with the 'head' in the right place would prevent the chain going up into the gap and jamming, cheap to try....

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felix.london
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Re: Chain jamming into chainstay

Postby felix.london » Tue Sep 25, 2012 06:40 am

What size rings are these? I wonder if changing to a 32/22 would make any difference? i.e a closer ratio, less of a drop when changing, easier for the granny ring to catch ?

..never experienced chainsuck on any of the bikes so I'm probably talking bo11ock$
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crimsondynamo
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Re: Chain jamming into chainstay

Postby crimsondynamo » Tue Sep 25, 2012 07:10 am

Yes but the picture the OP has shown has nothing to do with clearance.


True, but nor is the suck causing any problems at the point at which the photo was taken. It only causes problems when it gets wedged. If it doesn't get wedged it will eventually spring loose (if it's allowed to) as the tension on the chain increases.

This is my madey-uppey theory as to why some frames are more vulnerable than others, not to chain suck per se, but to chain suck being a problem. For example, has anyone ever complained of chainsuck on a stay-less swing-arm frame design such as Orange 5?

Chunkers1980
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Re: Chain jamming into chainstay

Postby Chunkers1980 » Tue Sep 25, 2012 08:14 am

Jamming is not the only reason it is bad. It knackers mechs and slows down your gear changes effecting your comfidence and how you ride.

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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Tue Sep 25, 2012 11:28 am

Erm...if it pinges off just after that photo so the rider never knew then how........

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nicklouse
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Re: Chain jamming into chainstay

Postby nicklouse » Tue Sep 25, 2012 11:34 am

robst3 wrote:Hey all,

I've got a carbon 456 with SLX 10 speed drivetrain. Experiencing what I thought was chain suck but not so sure now:

When changing down from the large to the small chain ring the chain isn't disengaging from the large ring and gets dragged up past the chainstay and jams there.

I've replaced the chain and both chain rings but it still happens. Photo below shows what is happening - if I pedal any further the chain goes up past the chainstay:

Image

OK.
the cranks are 9 speed? rings the same?
are the rings correctly aligned? (pics like above but off the bike?)
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1980jj
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Re: Chain jamming into chainstay

Postby 1980jj » Wed Oct 03, 2012 21:23 pm

Hi there, I have a cube ltd race, this has suffered with a similar 'chainsuck' problem you talk about, I'm in the process off upgrading to an xt crank thinking that it may be a problem with the chainring itself, I also was considering replacing the front mech as the derailleurisbstarting to look a bit mullered, the bike also runs slx shifters, I know very little about this bike lark but what I do know is your not alone and it knocks your confidence. Could it be the shifter for the front mech? Sounds stupid I know? Just looking for ideas to pour more money to resolve this annoying problem so I can ride with confidence again. By the way, my lbs offered no advice and neither did cube customer services :-(

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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Thu Oct 04, 2012 06:07 am

Fornt mech not relevant, nor shifters, it's a chain/chainring/rear mech issue.

1980jj
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Re: Chain jamming into chainstay

Postby 1980jj » Sat Oct 06, 2012 11:36 am

The Beginner wrote:Fornt mech not relevant, nor shifters, it's a chain/chainring/rear mech issue.

So here's a thought then, if I replace the front crank set and chain I'm in with a pretty good chance of reducing my chain suck chances????

Chunkers1980
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Re: Chain jamming into chainstay

Postby Chunkers1980 » Sat Oct 06, 2012 11:40 am

Yes.

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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Sat Oct 06, 2012 12:37 pm

Good chance, yes, assuming everything else is working as intended.

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BlueAdvocate
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Re: Chain jamming into chainstay

Postby BlueAdvocate » Tue Oct 09, 2012 13:03 pm

As another preventative option; try fitting a stinger for adding tension; think it was Northwind (on his C456) who had this and also placed a bolt through it to make sure if it happened the chain could not find a way through.

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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Tue Oct 09, 2012 15:01 pm

But a stinger adds no tension AT ALL and in this case the chainsuck will lift the chain off the stinger, so how it would help is beyond me!

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leaflite
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Re: Chain jamming into chainstay

Postby leaflite » Tue Oct 09, 2012 16:24 pm

The Beginner wrote:But a stinger adds no tension AT ALL and in this case the chainsuck will lift the chain off the stinger, so how it would help is beyond me!


Having a bolt through the stinger but above the chain would stop it from coming off the stinger.

Have you tried a more aggressively ramped middle ring, such as xt?

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the_moodster
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Re: Chain jamming into chainstay

Postby the_moodster » Tue Oct 09, 2012 20:38 pm

cyd190468 wrote:Does it still happen if you ditch the bash guard? Maybe it's too close to the big ring.


This

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BlueAdvocate
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Re: Chain jamming into chainstay

Postby BlueAdvocate » Wed Oct 10, 2012 07:24 am

The Beginner wrote:But a stinger adds no tension AT ALL and in this case the chainsuck will lift the chain off the stinger, so how it would help is beyond me!


Does it not? really? I would suggest that's how its fitted. Yes you can measure the chain over the stinger in a normal way (Big to big adding the 2 links); a subsequent tweak to the stinger position will increase the chain route adding tension. Fine lines may but it may help.
Anyway the part about the bolt still holds true as it will stop the chain getting between the ring and the stay.

crimsondynamo
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Re: Chain jamming into chainstay

Postby crimsondynamo » Mon Oct 22, 2012 21:58 pm

@robst3

Did you ever get a solution?

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The Rookie
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Re: Chain jamming into chainstay

Postby The Rookie » Tue Oct 23, 2012 07:23 am

BlueAdvocate wrote:Does it not? really? I would suggest that's how its fitted. Yes you can measure the chain over the stinger in a normal way (Big to big adding the 2 links); a subsequent tweak to the stinger position will increase the chain route adding tension.

Nope still adds no tension, there is no spring in it, it just changes the static chain route, the tension is purely a function of the position of the rear mech and the spring tension that creates, as the chain is sized to the same effective length with and without the stinger the tension has not changed at all, yes if you subsequantly move the stinger a fraction so you shorten the chain length by a tiny bit but still within the guide for sizing, you will chainge tension by a tiny bit, but relevant, no.


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