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  1. #1
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    Chain slip question for any bike mechanics

    I have just finished a new bike build, and have finally installed a new sram pc89 chain on the new FSA carbon mtb chainset, but noticed there was perhaps 1mm slip on the whole chain over the rings if you lift it away from the middle or large chain ring in the way you would to see how worn things are normally.

    Can this be right?, will riding on this not shag the chain rings quickly as you would expect?.

    Perhaps the chainset and chain are incompatible.

    Any answers much appriciated

    Thanks in advance.

    Andrew

  2. #2
    You need a new bike supcom's Avatar
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    The chainrings and chain are not inccompatible. All bikes use the same 1/2 inch pitch. Assuming you have a 9-speed rear, the PC89 is a good chain.

    Generally, the test for excess wear is if you can expose the top of a chainring tooth by pulling the chain away from the large chainring. Note that all chains pull away from the chainring because the rollers are loose on the pins so they will turn. Pulling on the chain takes up the slack between the pins and rollers. Since you have brand new components, wear is not an issue and you are fretting over nothing.

  3. #3
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    Excellent thanks for that, had an excellent ride yesterday with no major problems.

  4. #4
    Banned.
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    Quote Originally Posted by supcom

    Generally, the test for excess wear is if you can expose the top of a chainring tooth by pulling the chain away from the large chainring. Note that all chains pull away from the chainring because the rollers are loose on the pins so they will turn. Pulling on the chain takes up the slack between the pins and rollers. Since you have brand new components, wear is not an issue and you are fretting over nothing.
    I don't follow you. Can you explain this a little better? Thanks.

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