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Old 10-17-09, 03:35 PM   #1
moammar
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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.
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Old 10-17-09, 03:37 PM   #2
10 Wheels
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You never cleaned it in 3,300 miles?
Get a new chain.
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Old 10-17-09, 03:38 PM   #3
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No, I cleaned it. But it's stretched.
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Old 10-17-09, 03:41 PM   #4
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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.
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Old 10-17-09, 03:44 PM   #5
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Thank you. That's quite helpful.
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