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Old 03-31-21, 08:29 AM
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oldbobcat
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Location: Boulder County, CO
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Bikes: '79 Gios, '80 Masi, '06 Felt, early '60s Frejus

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Loss of indexing is almost always caused by the derailleur taking a whack and knocking the hanger out of alignment. If you don't have the alignment tool, take your bike to a shop and have the hanger checked and aligned. They will detach the derailleur, tweak the hanger, reattach the derailleur, and adjust, usually for less than 30 bucks.
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