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Old 11-13-07, 11:07 AM   #1
JMT114
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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?
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Old 11-13-07, 11:10 AM   #2
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Probably not.
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Old 11-13-07, 11:22 AM   #3
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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.
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Old 11-13-07, 11:48 AM   #4
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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.
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Old 11-13-07, 11:54 AM   #5
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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.

Sheldon "Match The Wear" Brown
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Old 11-13-07, 04:00 PM   #6
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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?
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Old 11-13-07, 04:09 PM   #7
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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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