Rear derailleur chain skip

[fredjunk2005]

Hello all,

This is my first post to this forum!

I fixed up my old road bike recently: replaced chain, new rear cassette, fine tuned rear and front derailleur setting. I really thought I had done a good job as it was running more smoothly than ever....

Until today, i.e. 2 weeks after the overhaul (i probably did 200 km with it since then - without any issues)

The chain "skips", i.e. it periodically kind of gets off the jockey pulley, which is really annoying!!! When cycling backwards, the chain just gets off the jockey and blocks.

This does not seem to be due to improper chain tension as problem persists regardless of which gear the chain is on.

In order to illustrate this better, I took a bunch of videos. I took 4, it is kind of overkill I know But just so the problem is very clear:

http://www.youtube.com/watch?v=av_vx5thRcc&feature=youtu.be
http://www.youtube.com/watch?v=1Q5Zr2twNZk&feature=youtu.be
http://www.youtube.com/watch?v=5dkFQqZWc2A&feature=youtu.be
http://www.youtube.com/watch?v=dnuPyn2rqgw&feature=youtu.be

What can I do about this? This is a high quality, albeit old, Campy friction derailleur, so I'd rather fix it than replace it with a cheap one.

Thanks a lot!!!

[xerxes]

It looks to me that you have a stiff link in the chain, one where the pin is too tight and not allowing the chain to swivel on that link.

[fredjunk2005]

thanks!!!! so i'm guessing a bit of oil?

the problem actually started after it rained on the bike.....

(05-13-2012, 09:30 AM)xerxes Wrote:  It looks to me that you have a stiff link in the chain, one where the pin is too tight and not allowing the chain to swivel on that link.

[xerxes]

Keeping the chain well oiled is a good idea, but you may need to losen off the stiff link mechanically.

Take a look at this: http://www.parktool.com/blog/repair-help/tight-link-repair-ct-3-ct-5-ct-6-ct-7

[Joe_W]

Additional remark: On a new chain there's the factory lube that is superior to anything you can come up with.