Freewheel Chain Slipping

[drglinski]

I remembered I have a gopro that can help me with things. Check this out.

It looks like a link is jumping or is bound up somehow. Remember it only happens on the smallest cog. Could it be a link that isn't worked out fully or a derailleur issue, etc? It doesn't bind up or catch when it's being run through easily, especially in the stand.

 

[GTs58]

Seeing the chain jump up like that would indicate a binding link to me. Does the chain have a quick link?

 

[drglinski]

The chain does not have a quick link. It was put on with a chain tool. Thanks.

 

[Metacortex]

Try another new chain. If that doesn't help then post a close-up pic of the small freewheel sprocket with the outer chain guard (top protector) removed. Perhaps one tooth is bent or malformed?

 

[GTs58]

The reason I asked if there was a quick link is there may be a chance that the link that was used to join the chain together is a tad bit tight. Sometimes it takes a little fiddle farting to get it just right so it doesn't bind, especially on a 14t gear.

 

[drglinski]

Still working on the driveline issue. I went through each link and they are all free. I'm going to get another chain and go from there.

 

[drglinski]

New chain, KMC Z33....same issue. Now I'm leaning towards freewheel. Who knows...I"ll put $$ into another one of those and it won't be the issue I'm sure. It only does it on the smallest cog.

 

[rustjunkie]

The smaller cogs wear faster. As chain wears the pitch is increased, and so the distance between the teeth on the cog(s) increases.
New chain installed: correct pitch on chain, old cog(s) worn to the pitch of the old chain and will "skip" under pressure.

http://www.sheldonbrown.com/chains.html

http://www.sheldonbrown.com/brandt/chain-care.html

A good old bicycle shop might have the small cog and might be able to install it for you.

 

[Metacortex]

The small 14T cog from just about *any* Schwinn Approved Model J freewheel (more specifically 2nd gen+ 1972 or later) will work as a replacement on a 1972 or later Sports Tourer freewheel. They are very common: http://www.ebay.com/itm/SCHWINN-APPROVED-MODEL-J-FIVE-SPEED-FREEWHEEL-14-28-NICE-/301922365757

 

[momo608]

odd place for this thread!

Excuse me if this was discussed but it sounds like a derailleur return spring tension problem.

Did you take these apart, clean and re grease them?