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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-
ST angle doesn’t really have a bearing on anything fit-wise, your saddle position is still set in relation to the BB.
This.
The only thing ST angle is important is for those who need the saddle further/nearer to the BB, which can be remedy by simply looking at the seat angle and Reach together.
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.
Zing.
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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?
edscoble
Tijmen
Doesn’t TT length also take into account ST angle and therefore saddle setback relative to bottom bracket? Something reach ignores completely, no?