Updated: 06/10/2019. This 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. Basic terms and what to pay attention to Most modern bicycles have … Read more Compatibility  Rear derailleurs
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