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  1. #1
    Senior Member JMT114's Avatar
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    Chain Length Question

    I am getting a new wheelset and instead of swapping the casette from my old wheel to my new wheel I am going to buy a new one. If i switch from a 12-26 to a 12- 25 or a 12-27, would i need to change the length of my chain?
    My name's Jim, but most people call me...Jim

  2. #2
    Your mom
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    Probably not.

  3. #3
    JRA. BikEthan's Avatar
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    But more likely than not you'll need to replace your chain as the cassette and chain wear together. Often an older chain and cassette will work fine together but as soon as you put a new chain on things start skipping like crazy.

  4. #4
    Jack of all (bike) trades
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    Again, most likely not. The derailer will take up or give slack as needed. 1 tooth generally won't matter either way. Just pay attention to make sure there is the right amount of tension at the derailer. You don't want it stretched to its max when you're in the highest gear or hitting the cassette when in the lowest. Again though, chances are you'll be fine.

  5. #5
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by JMT114 View Post
    I am getting a new wheelset and instead of swapping the casette from my old wheel to my new wheel I am going to buy a new one. If i switch from a 12-26 to a 12- 25 or a 12-27, would i need to change the length of my chain?
    You should always replace the chain when replacing the cluster.

    See: http://sheldonbrown.com/chains

    It will probably be the same length, if your original chain was correctly sized for your bike.

    See: http://sheldonbrown.com/derailer-adjustment for instructions on chain length.

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  6. #6
    Senior Member JMT114's Avatar
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    Quote Originally Posted by Sheldon Brown View Post
    You should always replace the chain when replacing the cluster.
    I just got the bike a couple months ago, the chain and cassette have just over 800 miles on them. Would you still recommend replacing the chain?
    My name's Jim, but most people call me...Jim

  7. #7
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    Quote Originally Posted by JMT114 View Post
    I just got the bike a couple months ago, the chain and cassette have just over 800 miles on them. Would you still recommend replacing the chain?
    No you couldn't have worn anything out that soon. Just put the cassette on and see what happens.
    I go from 11/23 to a 12/25 or a 12/27 all the time. If the chain is set up right should be fine.

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