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Converted vintage bike to singlespeed, now chain skips teeth

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Converted vintage bike to singlespeed, now chain skips teeth

Old 06-19-16, 07:08 AM
  #1  
Fallingwater
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Converted vintage bike to singlespeed, now chain skips teeth

*long exasperated sigh*

I have decided to forego re-dishing (the crazy oddball wheel at least for the moment (though the info in that thread will be useful in the future when I readdress the problem), instead using spacers and temporarily turning it into a single-speed, because I've had this bike in pieces for way too long and I'm getting frustrated to exasperation - at this point the idea of tossing the whole thing and buying a 170 citybike that actually runs from the start is starting to look alarmingly appealing, and I'd really rather not go there, if nothing else because I've spent so long tinkering with this one that admitting defeat would really depress me.

But I really want to be done with wrenching and just ride, dammit, and this frame has horizontal dropouts suitable for single-speed without a tensioner, so I've decided to go for it and think about restoring geared operation in the future, when my current wrench nausea has passed.

Of course nothing is ever so simple; apparently I can't fix a problem without another one taking its place.

----------

I shortened the chain appropriately, then mounted everything and now the chain skips a tooth regularly, resulting in an audible clunk and irregularity in the transfer of motion. I've tinkered with the chain and eliminated two relatively loose links that seemed to have lost the rollers, or maybe never had them, but it keeps doing it.

The chain used to work with a five-speed (15-16-17-18-22) Italian freewheel from the seventies, if that's any help.

Is this just a (very) worn chain misbehaving with new unworn components, or a deeper problem with chain pitch incompatibility? I have zero problems with buying a new chain and indeed intended to do it from the beginning (this one was in no better shape than the rest of the bike when I started work on it, and while I can remove rust with a wirebrush I can't fix links with ovalized holes), but if I do so and the new chain runs fine on the sprocket but skips on the chainring I've solved nothing.

Here's a video of the problem:

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Old 06-19-16, 07:38 AM
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That you're using an old chain on a new sprocket is most likely the problem. Also, your chain looks to be a bit loose.

Why doesn't the sprocket engage when you pedal forward?

Cheers
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Old 06-19-16, 07:48 AM
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My guess tight link.
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Old 06-19-16, 08:01 AM
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1) The chain is very loose.

2) How much stretch does the old chain have? If it's more than .75%, it should be changed. If more than 1%, it must be changed.
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Old 06-19-16, 09:06 AM
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Originally Posted by AlexCyclistRoch View Post
1) The chain is very loose.
I am aware. It's loose because if I tighten it properly, when it hits the point where it binds on the sprocket, everything seizes. It needs the loseness to continue moving. I basically only kept it loose so I could take the video and showcase the problem - I should have mentioned this.

2) How much stretch does the old chain have? If it's more than .75%, it should be changed. If more than 1%, it must be changed.
Very probably too much, and I will change it. Is this the only problem? Is there a good chance that a new chain will simply work, with no skipping on either the sprocket or chainrings?
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Old 06-19-16, 09:41 AM
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NB: nothing is perfectly machined round, particularly at low cost priority manufacturing, common in Bike parts Making,

And done in separate countries, let alone different companies.


Hint: 1) start over without used chains and rear cogs, buy New parts.
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Old 06-19-16, 10:02 AM
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Are you using a derailleur chain (3/32" width) with a rear cog that's intended for a wider (1/8") chain?

Last edited by prathmann; 06-19-16 at 01:11 PM.
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Old 06-19-16, 10:05 AM
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Originally Posted by prathmann View Post
Are you using a derailleur chain (3/32" width) with a rear cog that's intended for a wider (1/4") chain?
I think you meant to write 1/8th inch chain.

OP. I'd bet that a new "single speed" chain will make things just peachy.
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Old 06-20-16, 05:40 AM
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Bought a new chain, problem disappeared. Thanks all
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