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You'll sit in the same place relative to the BB no matter the steepness of the ST, but the TT is still 54.5, so the headtube is further away. Slackening the seattube and keeping everything else the same would yield a longer top tube, not a shorter one
Turkish-
won't a steep seattube actually put the saddle closer to the handlebars, effectively making it smaller*
*What I meant is shorter actually. Shorter toptube. So 'smaller' bicycle. Poor phrasing on my part.
But the point remains. Ed says the steep seattube makes the bike feel longer (56cm toptube instead of 54.5cm), but wouldn't it make it feel shorter? Like you said (but in reverse):
Slackening the seattube and keeping everything else the same would yield a longer top tube
With identical toptube lengths, surely the one with the steep seattube (blue) will feel shorter? Because the seat is positioned closer to the headtube.
Edit (re below): Ah, right. I wasn't
taking into accountunderstanding keeping the saddle at the same position relative to the bottom bracket (which I guess is a perquisite for a good bike fit), like @Turkish said. In that case it makes sense.
Tijs
Maybe it's past my bedtime, but won't a steep seattube actually put the seat closer to the handlebars, effectively making the frame edited shorter (instead of longer)?
Anyways, free bump.
Edit: Changed my statement from 'smaller' to 'shorter'. Was talking about the toptube.