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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 01-23-10, 12:49 PM   #1
DCwom
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What have I done - chain slip

First I have to admit this is on my single, however after neglecting our singles since we purchased and road our tandem all last year I decided it was time for some long over due maintance on my hybrid.

Cutting to the chase I replaced the chain and now it "slips" when under load, everything looks fine when I have it in my stand so I can't see what is happening. I was careful to buy a 7 speed chain so it shouldn't be a gearing mismatch. My "favorite" chain ring has some visable wear, but the chain slips on all chain ring and casette combinations.

Any ideas?
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Old 01-23-10, 01:26 PM   #2
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Most likely your chain is jumping on the cogs, not on the chainrings. You have 2 choices.

First you can buy a new cassette. This one will match the pitch of the new chain, so you won't have any skipping anymore. Just make sure that you do this soon as the worn sprockets and skipping will very quickly ruin your new chain. Once that has happened, buying a new cassette may be merely a waste of money.

Your second choice is to ride the bike as is for a while without standing up on the pedals. Avoid the skipping to happen by not putting too much force on the pedals. After 60-100 miles the chain and sprockets will match and therefor you will not experience any skipping anymore. Of course if you apply this solution, you should ask yourself why you even bothered to change the chain in the first place. I use it myself on my "crap bike" which I use for when road conditions are too bad. This bike only inherits worn out parts from my other "good" bikes.

My advice, get a new cassette, but you are a free man living in a free country.
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Old 01-23-10, 01:40 PM   #3
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or . . .check and see that chain was properly installed. You may have protruding chain plate/chain pin and that is a scenario for broken chain waiting to happen!
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Old 01-23-10, 02:03 PM   #4
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I second the advice to replace the cassette and see if that fixes the problem. The cogs on the cassette wear together with the chain, so as the chain pins wear and the spacing gets a little longer between links it still works ok with the old cassette cogs. But if you've waited a bit too long before replacing the chain then the new chain with it's correct spacing no longer engages the teeth on the old cassette cogs properly and you get skipping.
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Old 01-23-10, 04:35 PM   #5
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Third n the cassette. In general if you let your chains go and go and go before replacing, the cassettes usually will wear to a point where they skip with new chain. However we just came in from a ride, and all of a sudden our tandem started to skip a bit, especially under load. We were practicing standing, so I thought that maybe I tweaked something. Turns out that I had a tight link. Lubed everything, and loosened it up a little, and all seems fine. So as Zonatandem suggested, check the stuff first, then get the cassette if you find nothing. Also, if you have another wheelset laying around with the proper gearing, you could just swap it and see if ti goes away, which would tell you cassette. Seems as if we all have a few bike lying around. Well at least here....
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Old 01-23-10, 07:23 PM   #6
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If the bike is a 7 speed, there's a good chance of lots of miles on the cassette. Is it the original? My guess is a new cassette will make things good.
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Old 01-24-10, 02:35 PM   #7
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+3 or 4 on the cassette. Another factor could be your derailleur pulleys. They tend to wear on one side, and/or the teeth can become elongated so they will not mate with your new chain. Spend another $10-20 and replace those too.
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Old 01-25-10, 10:24 AM   #8
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Cassette is a good candidate as others have said.

Along with the suggestion to check that pins are set evenly is to check for a stiff link. Loosen the link if so.

How much wear did your old chain have?

All this is assuming your der. is adjusted correctly.
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