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your saddle position is still set in relation to the BB
And this should, in theory, be constant among all my bikes of different types?
Tijmen-
As I understand it, yes.
From what I’ve learned talking to bike fitters, in relation to saddle position, there is an objective optimal position based on your bio-mechanics.
The geometry of the frame should put you in the “correct” type of position for the intended type of riding.
“Cockpit” is more of a preference, there’s no ‘optimal’ in the way there is for saddle position. It’s a trade off of reach/comfort/aero/steering etc. etc.
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Yes, however if you says, have a TT bikes, then it gonna be a little different.
ThePeginator
edscoble
But a bike fit centres around the BB. Your saddle position is fixed in relation to the BB, which is why reach and stack are a better metric for frame sizing.
ST angle doesn’t really have a bearing on anything fit-wise, your saddle position is still set in relation to the BB.
I’m guessing TT measurement for sizing is basically a throw back to when all road frames were horizontal TT and 73/73, which then got carried over as “ETT” when compact frames came in, but as geometry has evolved it’s no longer that simple.