Bicycle Mechanics - Is this a chain worth changing?
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10-17-09, 04:35 PM
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?
10-17-09, 04:37 PM
You never cleaned it in 3,300 miles?
Get a new chain.
10-17-09, 04:38 PM
No, I cleaned it. But it's stretched.
10-17-09, 04:41 PM
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.
10-17-09, 04:44 PM
Thank you. That's quite helpful.
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