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  1. #1
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    Sram 8speed shifter compatibility

    I want to double check with you guys before I guy this

    I have a Sram 8 speed shifter that works with ESP 1:1

    I have a rear hub, with 8 speed cassette

    I can get a good deal on a Sram 9 speed rear deralleur that will work with ESP 1:1

    can I do this this? I think it will work

    and if I have this right, it will work because the rear mech limiting screws up/down can be adjusted to the 8 speed cassette

    and a 9 speed derailleur will work with a 7.8.9 shifters

    am I right on this??

  2. #2
    Senior Member Bill Kapaun's Avatar
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    The cog spacing is different between 8 & 9 speed cassettes. 9 speed has narrower spacing so that you can fit the extra cog on the SAME Free Hub.

  3. #3
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    yes, the hub can take either a 8 or 9 speed casstte,

    what i need to know will the rear 9 speed derailleur work with a 8 speed shifter?

  4. #4
    Senior Member Bill Kapaun's Avatar
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    Your 9 speed shifters will NOT shift the 8 speed cassette properly!
    A 9 speed shifter has a different amount of cable travel than an 8 speed shifter, per shift.
    7 shifts for X distance on an 8
    8 shifts for the SAME distance on a 9.

    The DER doesn't care. It only moves the amount determined by the shifter.

  5. #5
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by doco View Post
    yes, the hub can take either a 8 or 9 speed casstte,

    what i need to know will the rear 9 speed derailleur work with a 8 speed shifter?
    Without a doubt it will work.

    Think of it this way. A rear derailleur guides the chain by the middle of the chain. It doesn't care if the outside of the chain is a little wider or a little narrower.

  6. #6
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    Quote Originally Posted by Retro Grouch View Post
    Without a doubt it will work.

    Think of it this way. A rear derailleur guides the chain by the middle of the chain. It doesn't care if the outside of the chain is a little wider or a little narrower.
    Thanks, that is what I thought .. you can have a front 7-8-9 and a rear 9 and any combo will work

    you can also have a for example 8speed front shifter and a 7 speed rear derailleur

    that is what the limiting screws are for...


    thanks again, slowly getting it
    Last edited by doco; 05-13-08 at 05:20 PM.

  7. #7
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    Quote Originally Posted by Bill Kapaun View Post
    Your 9 speed shifters will NOT shift the 8 speed cassette properly!
    A 9 speed shifter has a different amount of cable travel than an 8 speed shifter, per shift.
    7 shifts for X distance on an 8
    8 shifts for the SAME distance on a 9.

    The DER doesn't care. It only moves the amount determined by the shifter.

    Bill, I am confused, I have 8 speed shifters (not 9 speed)

    so as above post, my 8 speed shifter will work with the 9 speed REAR

  8. #8
    Senior Member Bill Kapaun's Avatar
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    OK, I missed what you were saying.
    The DER should work fine.
    The shifters have to match the cassette.
    7-7, 8-8, 9-9

  9. #9
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    ahhh that's better not confused anymore..thank you Bill


    I have an 8speed 11-32 cassette on a shimano hub, 8speed shifter on handlebar and the 9speed rear derailleur I am going to buy

  10. #10
    Senior Member DieselDan's Avatar
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    Your shifter and cassette must match.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  11. #11
    Senior Member Matt Gaunt's Avatar
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    OP: essentially, ignore all the posts apart from Retro Grouch's for the most simple answer (which is correct as usual).
    Matt
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