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  1. #1
    Must... ride... more... Phil_gretz's Avatar
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    Switch To STI From Indexed Barcons; Rapid Rise Derailleur?

    My wife's 1980s Trek touring bike. I originally set it up with 9-speed Shimano barcons and a 3 x 9 touring configuration. Because she claimed that gearing was confusing to her, I chose to use a rapid rise (XT, I think) MTB derailleur so that when she pulled back on a shifter, the gearing got higher - same for both sides.

    Now three years later, she'd like STIs with little gear indicators windows. No problem finding 3 x 9 Tiagra or somesuch, but I'm concerned about the rapid rise rear derailleur.

    I've searched several older threads on this, and they discuss the limitations on downshifting (one click at a time with the small paddle), but no one had suggested that it wouldn't work. So, is it worth trying out with the existing derailleur? The return spring has plenty of oomph for barcon control, so why not STI?

    My wife isn't a multiple cog in one shift type of person anyhow. She maintains a fairly high cadence and makes frequent shifts, so double clicking on the small lever for downshifts won't be an annoyance to her (I think).

    I'd rather not swap out the derailleur if I don't need to...

    Thoughts?

  2. #2
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by Phil_gretz View Post
    My wife's 1980s Trek touring bike. I originally set it up with 9-speed Shimano barcons and a 3 x 9 touring configuration. Because she claimed that gearing was confusing to her, I chose to use a rapid rise (XT, I think) MTB derailleur so that when she pulled back on a shifter, the gearing got higher - same for both sides.

    Now three years later, she'd like STIs with little gear indicators windows. No problem finding 3 x 9 Tiagra or somesuch, but I'm concerned about the rapid rise rear derailleur.

    I've searched several older threads on this, and they discuss the limitations on downshifting (one click at a time with the small paddle), but no one had suggested that it wouldn't work. So, is it worth trying out with the existing derailleur? The return spring has plenty of oomph for barcon control, so why not STI?

    My wife isn't a multiple cog in one shift type of person anyhow. She maintains a fairly high cadence and makes frequent shifts, so double clicking on the small lever for downshifts won't be an annoyance to her (I think).

    I'd rather not swap out the derailleur if I don't need to...

    Thoughts?
    It should work. I've installed Rapid Rise on road bikes with STI shifters and never encountered a problem. I'm not a fan of Rapid Rise for other reasons.
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  3. #3
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    I've never tried it but wouldn't the numbers in the indicator window run backwards as compared to a conventional high-normal derailleur? I don't think this would be a show-stopper just something to get used to.

  4. #4
    Senior Member DieselDan's Avatar
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    Using STI with a low-normal derailluer will work just fine. The cable pull is the same, but the shifter will work backwards from usual. You can upshift three gears at a time.
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  5. #5
    Senior Member oldbobcat's Avatar
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    Fuji made a touring bike with STIs and a rapid-rise RD a few years ago. Worked fine.

  6. #6
    coprolite fietsbob's Avatar
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    Yea return spring pulls it to low gear,vs high normal. broken cable and the RD fails to low.

    SunTour Used to make a reverse FD, so cable pulled the chain off to the climbing gears.
    and so the late downshifting was more positive..

    too bad they did not make the guide cage out of better steel.

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