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Old 04-03-20, 10:50 AM
The dropped
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dsbrantjr gives great advice, your best option is to get a new chain. If your chain is 'stretched' it will quickly wear your new cassette.
If you measured your chain stretch and it's satisfactory, just use the chain sizing method Mr. Jones shows in this video.
You'll get the same information you would get from dsbrantjr's method without risking damage to your derailleur.
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