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  1. #1
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    Is this a chain worth changing?

    I've got a Shimano 9-speed that I suddenly realized as 3,300 miles on it, and judging by my ruler, is pretty well worn. But it pedals and shifts fine.

    Should I bother putting on a new one or wait till things get bad and switch the cassette at the same time? Will I be dooming my crank rings as well?

    Steve M.

  2. #2
    Galveston County Texas 10 Wheels's Avatar
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    You never cleaned it in 3,300 miles?
    Get a new chain.
    [SIZE=1][B]What I like about Texas[/B]
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    Set F1re To The Ra1n ( NY Night Rain Ride)
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  3. #3
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    No, I cleaned it. But it's stretched.

  4. #4
    Senior Member
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    This topic has been covered so many times it is ridiculous. Measure the actual elongation with a precision 12" rule. It's probably well beyond 12-1/16" between 24 pins but perhaps not.

    The only way to know for sure if your cassette is trashed is to put a new chain on and see if you get chain skip on one or more cogs, while pedaling under a heavy load.

    You can probably keep using the chain until the elongation reaches 1% or 1/8" over 12 inches without hurting the chainrings, but then you can be assured that some cogs will skip with a new chain.

  5. #5
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    Thank you. That's quite helpful.

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