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  1. #1
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    New question here. 9spd rear derailleur to 10spd?

    ...can I use a 9spd rear derailleur (rd-m662) with 10spd shifters and 10spd cassette? it needs to replace the jockey wheels?

  2. #2
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    9spd rear derailleur to 10spd?

    You'll need a 10spd derailleur as well, since pull ratio and leverage rate aren't the same.
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

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    ....Yeah, I knew that the ratio isn't the same for Mega9 and DynaSys systems, but for some reason I thought that the shifters doing all the work about that ratio. I was wrong. thank You, your answer made me search a bit deeper for what I want

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    9spd rear derailleur to 10spd?

    You're welcome.
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  5. #5
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    The cheapest way to go 10 speed is to use a RH "flat bar road" shifter SL-4600, 10spd cassette and 10spd chain. All other components can be 9spd like the RD, FD and crankset.

    The SL-4600 gear indicator is removable, but the little round cover (as found on the 9spd SLX and XT shifters) is not included.

  6. #6
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    9spd rear derailleur to 10spd?

    Negative, you can't use a 9 spd rd for a 10 spd setup.
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  7. #7
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    9spd rear derailleur to 10spd?

    Quote Originally Posted by David C View Post
    Negative, you can't use a 9 spd rd for a 10 spd setup.
    Double negative. The 10-sp flatbar ROAD shifters (as stated above) work fine with 9-sp rear derailleurs.
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    so at the end: the tiagra flat bar shifters will pull out 10spd from my 9spd RD? and I won't have misshifts or such due to incompatibility with the spacing of the 10 spd cassette? (sounds good )

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    9spd rear derailleur to 10spd?

    Quote Originally Posted by O'Lore View Post
    so at the end: the tiagra flat bar shifters will pull out 10spd from my 9spd RD? and I won't have misshifts or such due to incompatibility with the spacing of the 10 spd cassette? (sounds good )
    Correct.
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  10. #10
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    Or you could run the 7800 or 7900 bar end shifter on a set of Paul's thumbie conversion mounts. Supposedly this works great with modern drivetrains.

  11. #11
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    Re: 9spd rear derailleur to 10spd?

    Well in some cases these guys may be right but if you can't use a 9s rd on 10s system then how have i been doing what op is asking about all season?

    what your asking is easily doable.

    How you ask? (the the guys that said no, i know would be calling "bs" but can share pics if needed)

    Cause Ive been riding with that set up all season.

    Shifts great, no issues, reliable. Made me very happy I switched my Sram out for Shimano.

    My Derailleur is exactly what OP is asking about, SLX m662 9s RD.
    My shifters: '13 2/3 x 10 slx shifters, set up 2x10 with bash
    Cassette is HG62 11-34 10s (yes steel cassette, Im a clyde)
    KMC X10 Chain

    Got tons of miles both paved and trails including first race on this setup, never one complaint. RD shifts exact gear when I tell it to nice and smooth, never a hickup unless its my error (shifting under hard load, nasty mess on chain/cassette, etc and even then it shifts, just not as smooth and quick).

    Just like Sram, Shimano model levels are somewhat interchangable. The shift ratio is in the shifters, not the derailleurs.

    Sent from my HTC Sensation Z710e using Tapatalk 2
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  12. #12
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    Quote Originally Posted by tigris99 View Post
    Well in same cases these guys may be right but if you can't use a 9s rd on 10s system then explain to me why I have perfect shifting using a 9s slx rd on '13 slx new style 10s shifters with hg62 10speed cassette???????

    And to be more specific that exact m662 slx 9 speed rd that op is asking is exactly what I'm using.

    So what's the problem, works perfect for me great shifting perfectly reliable???

    Sent from my HTC Sensation Z710e using Tapatalk 2
    Because your version of perfect is far from it? Dyna-sys is in it's own bubble, you can't mix and match those derailiers and shifters with anything less than half ass results.

  13. #13
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    OK had to edit for one simple fact:

    I did buy RD as a take off On ebay, was brand new without box basically, listed as 9 speed m662

    So apologies however that it was it said I bought, looks exact same as any other 9 or 10 s slx RD ive seen and works perfect.

    However could have been listed incorrectly but how they couldnt tell 9s to 10s would be beyond me.
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