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Incompatibility of rear derailleurs and shifters is quite a complex topic, despite the simplicity of the operating principle. The thing is that standards change not only between manufacturers, but also within the same brand. Moreover, not only groups of different segments are incompatible, but also of the same purpose and the same speed group. All this seems confusing. However, everything is not so complicated. It's just that there are quite a lot of these standards, you don't have to remember them. In this video, we will talk about three factors that affect compatibility: Ratio, Pull & Cog Pitch. Here you can find a table in which I entered some data. This table with Ratio, Pull & Cog Pitch will be updated over time, and I need your help with this. https://docs.google.com/spreadsheets/... Also, you will find information from English-language resources useful: https://bike.bikegremlin.com/1278/bic... https://www.bikeradar.com/advice/buye... http://blog.artscyclery.com/science-b... Adapter manufacturer: http://www.jtekengineering.com/shiftm... Timing: 00:00 - What, again? 00:30 - How shifting works 02:49 - Terms Ratio, Pull & Cog Pitch 03:09 - Example 04:00 - Compatibility formula 04:59 - Why different standards are made 07:45 - Shifter compatibility 09:22 - Common compatibility 10:24 - Road with MTB 12:25 - Compatibility of different manufacturers 13:57 - Problem solving 16:25 - I hope you watched to the end and understood) My Instagram: / kapushak_vasile #bicycle #shifter #bike repair