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  1. #1
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    may need a chain.

    My chain come off about three time saturday. It only does it when I'm in 2front 3back and its in the same place on the chain. The front rings look good and so does the chain but every time it would kick out to the small ring. I just bought the bike used in Florida and the chain was pretty gummy so I cleaned it. Could it be gunk still in the chain doing this and I need to soak it?

  2. #2
    Mountain Man Dan
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    Measure your chain stretch.

    The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler at the side of one rivet, then looking at the corresponding rivet 12 complete links away. On a new, unworn chain, this rivet will also line up exactly with an inch mark. With a worn chain, the rivet will be past the inch mark. [For accurate measurement, the chain should be held under some tension -- either on the bicycle, or hanging. -- John Allen]
    This gives a direct measurement of the wear to the chain, and an indirect measurement of the wear to the sprockets:

    If the rivet is less than 1/16" past the mark, all is well.
    If the rivet is 1/16" past the mark, you should replace the chain, but the sprockets are probably undamaged.
    If the rivet is 1/8" past the mark, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at the 1/8" point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
    If the rivet is past the 1/8" mark, a new chain will almost certainly skip on the worn sprockets, especially the smaller ones.
    Chain Length

  3. #3
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    I'll check it when I get home today thanks. But if the chain is in good shape then what should I be looking for? limit screws and/or tension adjustments maybe?

  4. #4
    Mountain Man Dan
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    Rear der adjustment. If your chain is worn, you may need a new rear cassette, which would equal chain jump/bad shifting.

  5. #5
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    It's jumping on the front chain rings. Its jumping from two down to one.

  6. #6
    Mountain Man Dan
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    Is that middle chainring bent at all?

  7. #7
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    We looked it over and didn't see it bent but I'll look again today. It looks to be jumping from the link that the chain is put together at.

  8. #8
    Mountain Man Dan
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    Is the link sticking? Take the link in both hands and bend it as in if it were going around the chainring.

  9. #9
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    I worked it in my hand saturday and it felt free and didn't look bent. I'm at a loss on it but I'm going to go over it again today really close. Just looking for input and ideas lol.

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