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Doesn’t TT length also take into account ST angle and therefore saddle setback relative to bottom bracket? Something reach ignores completely, no?
Tijmen-
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.
ThePeginator
Why TT? the Reach is more accurate and any TT measurement should be ignored.