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chain hop/skip(5 posts)

chain hop/skipRubberbandman
Sep 28, 2002 4:59 PM
I'm having a difficulty isolating a problem with my chain skipping or hopping and I hope you someone can offer a solution. When I'm putting a good amount of force on the pedals (e.g. riding up hill) my chain is skipping. Sometimes it changes to the lower cog or sometimes skips but stay on same cog.

Here is my chain of events.
Friday: replace chain
Ride Saturday no problems.
Saturday evening: replace rear derail. cogs.
Sunday: chain is skipping.

Any suggestions?

Thanks in advance for your help.

Two thingsMcAndrus
Sep 28, 2002 5:14 PM
1. If you changed the chain, perhaps the chain was old and has worn out some teeth on the chainring or cassette. I've had that happen.
2. Have you looked down at the bottom bracket when this happens? If so, is there an extraordinary amount of movement in the bottom bracket? I had a bike that developed a hairline fracture in the bb shell and chain skip was the first symptom.
Chain stretchspookyload
Sep 28, 2002 5:40 PM
Sounds to me like your old chain was a little long in the tooth. Problems like this can cause your drivetrain to make all kinds of noise. The first thing you should check is the pulleys you replaced. If it was a Dura ace deraileur it needs an 11 tooth pulley. I am not sure about Ultegra or 105, but make sure the one you put on is the same number of teeth. It can cause skipping by running a standard 10 tooth pulley on a deraileur designed to use an 11. Also if you didn't get Shimano pulleys then you are going to have problems because the top pulley is a floating pulley on Ultegra and Dura Ace deraileurs. This allows the rear der to float a little and make up for slight imperfections in the drive train line. Just as a guide...the 11 tooth pulleys are around $40 a set, so if you spent much less then that could be your problem.
The next thing to look at is the condition of you rear cassette. If you went a long time between chain replacements, you could have damaged the cassette from the streched chain. It will actually reshape the cogs on the cassette while it stretches. That usually only happens if you don't change your chain for 3000+ miles though. If that is the case then you probably need the new cassette. But since this happened after you replaced the pulleys, I tend to think you put a 10 tooth pulley on where it needed and 11 tooth, or vice versa.
When you replace the chainKerry
Sep 28, 2002 5:48 PM
you very often have to replace at least your most used cassette cogs. 99% of the time, this is the problem. The only way you can avoid this is to change the chain very often (well before it gets to 1/16" elongation per 24 links).
re: chain hop/skipMe Dot Org
Sep 28, 2002 6:08 PM
I'm going through a very similar problem right now. I still haven't solved it, but some things to look at, besides chains and derailleur cogs:

Check chain for binding links.

Cable stretch - maybe time for new shifter calbes

If you have index shifters, you may need to rebuild the right one (depending on the mileage)

Your cassette may need a partial/total replacement due to wear.

Your front rings may be worn. Expensive to replace, but worth it.

You don't say what kind of shifters, how many miles, etc...could be helpful in diagnosing

Good luck!