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  1. #1
    Kid disguised as an adult
    Reputation: ric426's Avatar
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    New Shimano rear derailleurs still 2:1?

    I really have done searches for the answer to this seemingly easy question, but didn't come up with anything. Do the newer Shimano rear derailleurs (M771, etc.) still use a 2:1 ratio? I like my SRAM Attack twist shifters, but would like to get a new rear derailleur and wanted to make sure I wasn't going to run into compatibility problems with a new Shimano one.

  2. #2
    bi-winning
    Reputation: rkj__'s Avatar
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    if you have 1:1 shifters, you need a sram rd.
    When under pressure, your level of performance will sink to your level of preparation.


    Shorthills Cycling Club

  3. #3
    Kid disguised as an adult
    Reputation: ric426's Avatar
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    I know, but the SRAM Attack shifters are 2:1 to be compatible with Shimano.
    Since I haven't bought a new rear derailleur in a few years and haven't been keeping up on the yearly changes in drive train technology, I just want to make sure I didn't miss a change in their activation ratio.
    I figure they haven't changed it or there'd be all sorts of marketing hype about the advantages of the "new 3.14159:1 shift ratio" or something. This whole indexed shifting thing is just a fad anyway and in a couple years we'll all be using those new friction thumb shifters from Suntour...

  4. #4
    Nightriding rules SuperModerator
    Reputation: crisillo's Avatar
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    the new shimano stuff has the same pull ratio as before...no change there..so your Attack should still work fine..

  5. #5
    Kid disguised as an adult
    Reputation: ric426's Avatar
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    Just what I wanted to know. Thanks!

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