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  1. #1
    Pedal turner hyunelan2's Avatar
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    What Chain can I use?

    I'm in the process of converting over my 8-speed Sora/Tiagra-based Specialized Sequoia, to 105 components. Everything I've ordered is the 9-speed variety (as opposed to the 10). I was going to keep my Sora Shifters and rear cassette for now.

    I don't know if I need to use an 8-speed chain (to match rear cassette) or a 9-speed chain (to match front chain rings and rest of components). This is the last stumbling block and my project will be complete... well, ordered anyway.

  2. #2
    Elitist Troglodyte DMF's Avatar
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    I'd use the 8-speed. 9-speed tooth is - if anything (and I don't think there's a difference) - a little thinner. Too-wide chain is better than too-narrow chain.
    Stupidity got us into this mess - why can't it get us out?

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  3. #3
    robhunterx robhunterx's Avatar
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    The various chainrings are pretty indifferent...while the spacing is definitely different on the various cassettes. Match your chain (and shifters) to the cassette.

  4. #4
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    I think you could use either. If the crankset is a triple, or if the front derailleur is a 9-speed, I'd use a Shimano 9-speed chain to reduce chainrub on the front derailleur.
    I would not run an 8-speed chain on a 9-speed cassette but I think you can run a 9-speed chain on an 8-speed cassette just fine. This is based on posts made by others. YMMV

    Al

  5. #5
    Pedal turner hyunelan2's Avatar
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    It will be a double, with a 9-speed FD. Cassette and shifters are 8 speed. I think I'll just hold off on the new chain temporarily and try to set it up with my existing 8-speed chain. If there is rubbing on the FD, I'll try a 9-speed chain.

    My first worry was that the narrower 9-speed chain would get stuck 'between gears' on the 8-speed rear cassette. Is this a legitimate possibility?

  6. #6
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    if u are using the 8 sp cassette it is advisible to use the 8 speed chain.A new 9 speed chain might not match a used cassette.

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    Quote Originally Posted by hyunelan2
    My first worry was that the narrower 9-speed chain would get stuck 'between gears' on the 8-speed rear cassette. Is this a legitimate possibility?
    I don't think that would be a problem. Your plan to try the 8-speed chain first is good, unless the chain is stretched.

  8. #8
    Elitist Troglodyte DMF's Avatar
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    Quote Originally Posted by hyunelan2
    If there is rubbing on the FD, I'll try a 9-speed chain.
    If there is chain rub, adjust the dérailleur.

    My first worry was that the narrower 9-speed chain would get stuck 'between gears' on the 8-speed rear cassette. Is this a legitimate possibility?
    Good question. I doubt that the width is that much different, but I was wrong once.
    Stupidity got us into this mess - why can't it get us out?

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