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Newest 'derailleur-hanger' Questions - Bicycles Stack Exchange
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https://bicycles.stackexchange.com/questions/90232/is-rear-derailleur-hanger-numbering-standardised
terminology - Is rear derailleur hanger numbering standardised? - Bicycles Stack Exchange
I broke my hanger, and had to find a replacement. One listing I found for a "#23" looked quite different, and the seller said: These numbers are created by the...
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