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  1. #1
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    Will an 8 speed rear derailleur work with a 9 speed shifter and cassette?

    Can an 8 speed shimano deore rear derailleur be made to work with a 9 speed shifter and cassette? I recall a lbs employee saying its possible to make a 9 speed derailleur work on a 10 speed set up awhile back. True? Are either of these possible?

  2. #2
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    Yes (within the respective brands) and no, not reliably, respectively. 7/8/9 all use the same cable pull, 10 speed in both brands is unique.

  3. #3
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    Sure no problem at all, now the 10speeds are different than the older models and require more cable pull..

  4. #4
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    So I take it its all a matter of derailleur adjustment and mating it to a 9spd shifter and cassette? How would I go about making the adjustments to make it work? Are there any complications to worry about? Wschruba mentioned that there may be reliability issues.

  5. #5
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    I ran an 8 speed Alivio RD on a 9 speed XT / XTR drive train as a stop gap after I kopped a trail snake and bust the cage on the XTR one. I needed a lightly longer B screw to clear the 34T cassette and one of the limit screws (think it was the high) was right at the edge but other than that it worked surprisingly well - one thing I would say is make sure you have a chain stay protector - the RD spring is not as strong as the Shadow RD's and you will get chain slap over even moderate bumps - it occasionally dropped the chain when very rough so I wouldn't go DH or anything with that set up but for XC or general trail riding it's OK.
    BTW you can use Shimano 9 speed MTN RD's with 10 speed road shifters but not 10 speed mtn shifters.
    Last edited by SimpleJon; 04-12-2013 at 11:32 PM.

  6. #6
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    Quote Originally Posted by CyclesnIPAs View Post
    Can an 8 speed shimano deore rear derailleur be made to work with a 9 speed shifter and cassette? I recall a lbs employee saying its possible to make a 9 speed derailleur work on a 10 speed set up awhile back. True? Are either of these possible?
    Hmm, which model is it exactly as I don't remember Shimano Deore ever being specifically an 8-speed derailleur... Nevertheless it doesn't really matter as an 8-speed derailleur should work with 9 speeds.

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