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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 11-19-09, 05:26 PM   #1
acoustophile
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chain stretch

My chain stretched to the point where it skipped off of the cog while riding last night. Being away from home and it being too late to hit up my nearest LBS, I used my chain tool and removed a link and then tensioned it up.

I realise that this is bad for my cog and chainring, but is there any risk of the chain snapping or breaking off?
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Old 11-19-09, 05:53 PM   #2
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are you sure your wheel isn't slipping?
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Old 11-19-09, 06:03 PM   #3
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It's gonna be bad for your cog/chainring, but that's if you ride that for days and months on it.

I don't think chain is going to break if properly done and done on a link you have never "touched" before. I would get straight home not doing any sprints and hard-climbing. Then have the chain replaced tomorrow.

I would have moved back my rear axle back on the track ends. You ought to buy a chain length checker. It's geeky, but it's convenient. Most of LBS people seem to eye-ball this type of stuff unless you specifically ask for it.
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Old 11-19-09, 06:09 PM   #4
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Removing a link is not going to have any affect on the chain skipping or anything else caused by wear (what you are incorrectly calling "chain stretch"). It's not that the chain is too long overall, it's that there is too much distance between each link - more distance than there is between each tooth on the sprockets. A chain that is too long will just be saggy; a worn chain is what cause it to climb off the sprockets.

You probably need a new chain. Measure the amount of stretch and report.

No, don't buy a chain checker. They are all inaccurate and will have you replacing your chains too often. All you need is a 12" steel ruler and knowing how to use it.
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Old 11-19-09, 06:21 PM   #5
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Removing a link is not going to have any affect on the chain skipping or anything else caused by wear (what you are incorrectly calling "chain stretch"). It's not that the chain is too long overall, it's that there is too much distance between each link - more distance than there is between each tooth on the sprockets. A chain that is too long will just be saggy; a worn chain is what cause it to climb off the sprockets.

You probably need a new chain. Measure the amount of stretch and report.

No, don't buy a chain checker. They are all inaccurate and will have you replacing your chains too often. All you need is a 12" steel ruler and knowing how to use it.
Chains shouldn't stretch if they are tensioned properly. Is this a conversion that doesn't have track ends?
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Old 11-19-09, 06:28 PM   #6
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Huh? Chains can't "stretch" at all. They are made of metal (or at least mine are).

What y'all are calling "chain stretch" is accumulated wear. Tension adjustment has no effect on wear.



FYI, each full link is 1" long. To check wear, measure 12 links of the tensioned chain, pin center to pin center. Up to 12 1/16" (1/16" of "stretch") is okay. 1/8" is sketchy. Over that and you should start thinking about replacing the small sprocket. There is some controversy about how much wear you should allow. Check the Bicycle Mechanics forum for more info.
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Old 11-19-09, 06:29 PM   #7
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Huh? Chains can't "stretch" at all. They are made of metal (or at least mine are).

What y'all are calling "chain stretch" is accumulated wear. Tension adjustment has no effect on wear.
Thank you for this intelligent post. You'd be surprised how many people think that chains actually stretch.
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Old 11-19-09, 06:34 PM   #8
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There is no way that your chain has worn so much that you can remove a link.
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Old 11-19-09, 06:49 PM   #9
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Thank you for this intelligent post. You'd be surprised how many people think that chains actually stretch.
Heh. Thanks. I normally don't visit here, but I saw this one scroll by on the ISpy page and couldn't help replying. ISpy is pretty cool. If it's a feature of the new forum software then the change-over is a net gain.
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Old 11-19-09, 06:51 PM   #10
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There is no way that your chain has worn so much that you can remove a link.
lolwut?
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Old 11-19-09, 07:33 PM   #11
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I knew that the chain was on it's last legs. It was super saggy and I was just too lazy to do anything about it until it jumped off the cog. It's a conversion and I had the chain tensioned all the way to the back of the dropouts. After falling off and removing a link, I moved the wheel a little bit forward and tensioned from there.
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Old 11-19-09, 07:58 PM   #12
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Heh. Thanks. I normally don't visit here, but I saw this one scroll by on the ISpy page and couldn't help replying. ISpy is pretty cool. If it's a feature of the new forum software then the change-over is a net gain.
pretty sure it was there before.
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