STI or ERGO with Ultra-6 ?

Discussion in 'Cycling Equipment' started by Bruce Lange, May 5, 2003.

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  1. Bruce Lange

    Bruce Lange Guest

    Will 7-speed STI levers (RSX, 105, or Sora) or any Campy levers index in an acceptable way with a
    Suntour Ultra-6 freewheel? And how about 8 speed levers?

    Thanks everybody,

    -Bruce-
     
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  2. In article <[email protected]>, Bruce Lange
    <[email protected]> wrote:
    >
    >Will 7-speed STI levers (RSX, 105, or Sora) or any Campy levers index in an acceptable way with a
    >Suntour Ultra-6 freewheel? And how about 8 speed levers?

    Should not work with any of the above. You need a 7-speed Shimano compatible freewheel and it will
    interoperate with Campy or Shimano 8 speed equipment. Keep derailleur and shifter brand matched for
    best results.
     
  3. Bruce-<< Will 7-speed STI levers (RSX, 105, or Sora) or any Campy levers index in an acceptable way
    with a Suntour Ultra-6 freewheel? And how about 8 speed levers?

    Not the ultra but probably a standard 7s frewheel due to spacing. Altho the lack of tooth prep to
    enscourage index shifting may make it unusable-

    A DA 7s freewheel would work fine with either shimano 7s shifters or Campagnolo
    8s.

    Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
    (9)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene"
     
  4. Bruce Lange wrote:
    > Will 7-speed STI levers (RSX, 105, or Sora) or any Campy levers index in an acceptable way with a
    > Suntour Ultra-6 freewheel? And how about 8 speed levers?

    Shimano 7-speed and Campagnolo 8-speed systems both use the same 5 mm sprocket spacing, with is also
    pretty close to the spacing of Ultra 6, so the indexing shouldn't be a problem.

    Note however, that old Ultra 6 stuff was always known to provide rather poor _shiftint_ even though
    the _indexing_ will be Ok. Some "overshoot" may be required for downshifts.

    Sprockets made since the late '80s have computer-designed teeth that have gotten us all spoiled. The
    Sun Tour stuff was the hot ticket in its day, but if you've become used to modern shifting, you're
    likely to be dissatisfied with the shifting performance.

    Sheldon "Old Frames, New Parts" Brown +------------------------------------------------+
    | You can get more with a kind word and a gun | than you can with a kind word alone. | -- Al
    | Capone |
    +------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone
    617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide
    http://captainbike.com http://sheldonbrown.com
     
  5. A Muzi

    A Muzi Guest

    "Bruce Lange" <[email protected]> wrote in message
    news:[email protected]...
    >
    > Will 7-speed STI levers (RSX, 105, or Sora) or any Campy levers index in
    an
    > acceptable way with a Suntour Ultra-6 freewheel? And how about 8 speed levers?

    Suntour's Accushift spacing is veriegated - the cogs are closer in the low gears than in the high
    gears so that type of freewheel would need extensive modification ( to an evenly-spaced format) in
    order to index with any modern system. An Ultra adds the handicap of very closely spaced cogs which
    lack ramps, lack twist-teeth, lack any enhancement to downshifting. I'd be surprised if, having made
    some adequate accomodation for spacing/travel, you were happy with the shifting ressponse. And
    arranging appropriate spacing/travel is in itself daunting.

    --
    Andrew Muzi http://www.yellowjersey.org Open every day since 1 April 1971
     
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