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  1. #1
    Senior Member Plainsman's Avatar
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    Probably the most elementary wheel question ever...

    Just bought a spare wheel with a 9 speed cassette/hub to use on the trainer. Then promptly sold the 9 speed bike. Now I have a 10 speed bike and a nine speed rear wheel. Anyway to use it for a ten speed? Am I better off just buying something like a Forte Wheel and searching for a used 10 speed cassette ( I know I need the 10sp cassette in any case)?
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  2. #2
    Making a kilometer blurry waterrockets's Avatar
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    Yeah, the 10-speed cassettes come with a spacer to fit them on 9/10 combo hubs (which are the same as plain 9-speed freehub bodies).

    If you don't have the spacer that came with your cassette, hit the LBS.

  3. #3
    Senior Member Plainsman's Avatar
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    Hi waterrockets, let me see if I understand you. Are you saying that the 9 speed wheel I have (rolf vector pro) will work with a new 10 speed cassette, I just need a spacer or something like that? If so, this is great news!
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  4. #4
    Making a kilometer blurry waterrockets's Avatar
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    Yeah, the splines fit, but the 10-spd cassette is narrower. The spacer makes up the difference (it goes on before the cassette.

    A new 10-spd cassette will include the spacer.

  5. #5
    Senior Member Plainsman's Avatar
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    Quote Originally Posted by waterrockets View Post
    Yeah, the splines fit, but the 10-spd cassette is narrower. The spacer makes up the difference (it goes on before the cassette.

    A new 10-spd cassette will include the spacer.
    So a 10 speed cassette actually takes up less width than a 9? I would never have thought! Just for my general knowledge, why did they do that? Was there something gained by placing the cogs in a 10 speed cassette that much closer together than in a nine. Were there issues with cross chaining if they just took a basic nine speed cassette with its standard spacing and added an extra cog?

    More importantly, will the bike experience any performance issues if I go the spacer and 10 speed cassette route on this old nine speed wheel?

    Thanks for being so helpful!
    Life IS an endurance sport. Finish Well.
    Finish Well Endurance

  6. #6
    Making a kilometer blurry waterrockets's Avatar
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    The only real reason is that you can now build a 10-speed-only wheel with less dish on the drive side, so the wheel will be stronger. Mildly.

    There's no performance disadvantage other than the weight of the spacer, which is about 3 RCHs...

  7. #7
    Senior Member capwater's Avatar
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    8s and 9s take up the same total width, just wider spacers on the former. 10 is almost the same, consider the thin spacer a remainder like when ya did grade school math with your "guzintas".

  8. #8
    Senior Member Plainsman's Avatar
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    Great information, thank you again. Okay, hopefully the final question then. My purpose for this is to have a wheel I can use on the trainer, so... if I buy an identical 10 sp cassette to what is on my bike now, I should not have to do any RD adjustment when I switch these wheels in and out, correct?
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  9. #9
    Making a kilometer blurry waterrockets's Avatar
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    Yeah, the spacing should be standard. Some axles have an issue, though. Chances are that it will shift well enough for trainer use anyway. If not, just learn how many barrel clicks it takes, and make that part of the trainer setup.

  10. #10
    Senior Member smurf hunter's Avatar
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    I have an old 7/8 speed Dura-ace hub I built into a wheel and put on a 10spd cassette. Love or hate Shimano, but you've got to admire that Japanese engineering detail to backward and forward compatibility.

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