Chainline and Q-factor with Jet9 build?- Mtbr.com
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  1. #1
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    New question here. Chainline and Q-factor with Jet9 build?

    Hi,
    Ordered a Jet9 large frame, CK headset with a RS Reba 80mm SL and I want to build it light.
    What's the smallest possible size for a square tapered BB to keep the chainline and Q-factor low?
    To be used with Middleburn RS8 cranks and 4 arm spider used as a double running 36 or 38 TA blades on the middle position and 26 on the granny position.
    This together with a 11-34 cassette and a KMC X9-Sl chain.
    If I keep the chainline short it should be possible to run a DA front shifter?
    The rest of my plans:
    Ultegra or DA barend shifters with Pauls adapters.
    I-link Alligators shiftercables.
    Avid BB7's+ Alligator Windcutter 180mm with I-link shiftercable and Steinbach Micro V2 levers.
    Ritchey Carbon stearer with foam grips
    Selle Italia SLR XC.
    Stans Arch's with Hope Pro II hubs.(Not the lightest but bomb proof )
    Tires Karma or Racing Ralf...

    Any suggestions especially for the drive train or general, please shoot...
    Perhaps someone tried a similar set-up and can give me some valuable info?
    Nothing is definitive yet.

  2. #2
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    Check my post in the WW forum for some ideas. I am also building a similar Jet9.

    But I can't help you with your technical questions

  3. #3
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    I run a pair of 94 bcd Suginos that have a fairly low Q-factor on my Leviathan, and use a 118mm bb. I could go smaller, but not much (without hitting my heels on the chainstays).

  4. #4
    jrm
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    A 110mm

    Quote Originally Posted by Dikkie
    Hi,
    Ordered a Jet9 large frame, CK headset with a RS Reba 80mm SL and I want to build it light.
    What's the smallest possible size for a square tapered BB to keep the chainline and Q-factor low?
    To be used with Middleburn RS8 cranks and 4 arm spider used as a double running 36 or 38 TA blades on the middle position and 26 on the granny position.
    This together with a 11-34 cassette and a KMC X9-Sl chain.
    If I keep the chainline short it should be possible to run a DA front shifter?
    The rest of my plans:
    Ultegra or DA barend shifters with Pauls adapters.
    I-link Alligators shiftercables.
    Avid BB7's+ Alligator Windcutter 180mm with I-link shiftercable and Steinbach Micro V2 levers.
    Ritchey Carbon stearer with foam grips
    Selle Italia SLR XC.
    Stans Arch's with Hope Pro II hubs.(Not the lightest but bomb proof )
    Tires Karma or Racing Ralf...

    Any suggestions especially for the drive train or general, please shoot...
    Perhaps someone tried a similar set-up and can give me some valuable info?
    Nothing is definitive yet.
    or 113mm with a compact specific FD like the SLX. Should work great with the pauls thumbies & DA barcons in either indexed or friction modes..

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