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Jonny69 in reply to @frankenbike

article that describes long cage 9-speed MTB derailleurs with front mechs and big cassettes

That's great stuff. You can probably tell I'm not well up on gear compatibility, especially mtb stuff, so cheers for that!

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frankenbike in reply to @Jonny69

I refer to this a lot as well:

http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/

basically Shimano 7-9 MTB and 7-10 road are all compatible with each other, and with SRAM you just match parts together according to whether it's "Exact Actuation" or "1:1 Actuation". I don't mess with Shimano 10 MTB, 11 road/MTB, or Campag

like I said though, I have got Exact Actuation and Shimano-compatible friction shifters to work. As you can see in those tables Shimano pull ratio is 1.7 and Exact Actuation derailleur shift ratio is 1.3 compared to 1:1 Actuation ratio of 1.1. So you can see I don't need to pull quite as much cable as you do to get through the whole cassette. Which'll be why mine works and yours doesn't.

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