I can't address your size questions, since I'm a bit taller, but I can
address the top tube question. Yes, this is something to be careful about, *if
you are particular about where you want to place your drop bars. *I am not
saying that Rivendell tt sizing will be a problem for you, but it *might* be
a problem for you.

Example: I owned a 56 cm (57?) Sam Hillborne that had a 59 c-c tt. I wanted
to put a drop bar on it, and particularly a 46 cm Noodle, quite a bit wider
than the 42s I was used to. In order to get a comfortable position on hoods
and hooks, I had to position the bar some 1 1/2" or 2" higher than saddle
-- which felt awkward to me. That was one reason I sold it. I would not
even have been able to set it up like my Matthews, the SH replacement, with
such a long top tube, because with this "road bike for dirt" I like the bar
about even with or perhaps 1 cm above saddle  -- a long ramped Maes
Parallel, but only 42 cm wide

My road drop bar position (dialed in over 25 years) is presently a gentle 3
cm below saddle. I would not be able to get that position on the Sam Hill
because of the top tube. (Not that I'd set up the SH exactly like my road
bikes, but you get the picture.)

OTOH, my 3 custom Rivs have all had 56.5 or 57 cm c-c tts; this is perfect;
with a 8 cm stem and long-reach/shallowish drop bars (Compass Maes
Parallel, 37 or 38 mm wide) 3 cm below saddle, I get very comfortable
positions on ramps, hoods, and hooks.

In fact, one of the very best fitting bikes I've owned was that 1958 Rene
Herse which had a 60 cm c-c st and a 56 or 57 cm c-c tt -- perfect; I only
had to adjust the saddle.

Now if you use upright or "tourist" bars like the North Road or even more
so the Albatross and so forth, top tube length is (I think; I'm not an
expert on these bars, though I've used many such) far less of a determinant
in comfortable bike setup. And even for drop bars, if you care only about
reach and not about height, then again, tt length is far less of a concern.

Top Tube length matters!


On Mon, Oct 10, 2016 at 9:43 AM, Belopsky <[email protected]> wrote:

>
>
> Riv sizing talks about me riding 55-57cm depending on the frame, but I
> always worry that the top tube is too long. Anywho, I was under the
> impression that for a 'fast' bike you want a slightly longer stem, for more
> weight in the front..but also with bars at seat height I suppose I can ride
> a bigger frame with a shorter stem - how short is too short, with drop bars
> - anything can work with some pullback.
>
>

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