Compatibility [04] Rear derailleurs | BikeGremlinThis post explains bicycle rear derailleur compatibility, i.e. what derailleurs can work with which number of rear sprockets (cassettes) and which rear shifters. For explanation of other rear derailleur functioning and limitations, such as chain wrap capacity, read this article: Rear derailleur. Before you start, to avoid any misunderstanding: please take the 5 minutes needed to read the compatibi
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