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  1. #1
    RFC
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    Senior Member RFC's Avatar
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    Well. . . , it's C&V for a Tri / TT bike

    Here is my purchase today -- a 1996 or 1998 Scott Waimea. This is the seller's picture.



    Yes, I know, it is missing some parts.

    I want to get the right components for it, however, this is going to be a fun project and not another money pit.

    It is an 8-speed and appears to have originally been outfitted with Shimano 105.

    Please help me select components.

    Will 9-speed bar ends and rear derailleur work with the 8-speed cassette?

    What crank should I get and what length should it be?

    The cassette is 12-13-14-15-16-17-19-21. What size chain rings would be appropriate.

    Thanks as always,

    RFC

  2. #2
    Seņor Member USAZorro's Avatar
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    Where do you get the brake levers that fit on those tri bars?
    The search for inner peace continues...

  3. #3
    Old Skeptic stronglight's Avatar
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    Any Shimano 9-speed cassette would fit the 8-speed hub, if you already have 9-speed barend shifters which you plan to use. Otherwise, I suppose you could change out all the spacers on the 8-speed cassette to 9-speed spacers and you would just have an additional non-functioning notch in the indexing.

    With a new 9-speed cassette you could also add an 11 tooth cog for your top gear and still have all the other cogs the same as are currently on the 8-speed. --- By doing this, using a 53t chainring, this would give you a 126 inch gear versus just the 116" now on the 8-speed... or, put in other terms, pedaling at 100 rpm you would hit 37.7 mph versus just 34.5 mph with the 12t cog when pedaling at the same cadence. .... AND, ironically, most 9-speed cassettes are actually lighter than comparable 8-speeds.

    Any crank you want to use should work. However, I've seen some TT bikes set up with 42x52 rings rather than the rider's usual 39x53... just because he did not need the lower gears which the 39t chainring offered, and also with longer crank arms than the rider usually used (175 mm versus 170). Unfortunately, I've only seen chainrings correctly paired with these two combinations - at least for Shimano.

    David Millar used only a single 53t chainring and no front derailleur. However he also screwed up at the start of that particular TT race and accidentally slipped the chain off without the front derailleur to catch and re-align it, so he actually lost time in spite of lightening his bike.

    By the way, that stem on that bike looks like it is setting the bar rather high for a TT bike... but that should be easy enough to change out.

  4. #4
    Old Skeptic stronglight's Avatar
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    Quote Originally Posted by USAZorro View Post
    Where do you get the brake levers that fit on those tri bars?
    USAZorro,
    Those look to me like Dia-Compe's "model 188". I think they're still made. Otherwise, Tektro makes a very similar set - often sold re-badged as Nashbar's house brand. All of them are pretty inexpensive and really simple to set up.

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