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It just seemed counter-intuitive that moving up from 60 to 63 would result in a shorter reach, but when looking closer at the chart there is a difference in seat tube angle too.
The -1 degree seat tube angle (between 58 and 63) cancels out the +2.5 cm in effective top tube length and results in the same reach.
Thomas_M
It is why TT length is a poor measure of fit.
https://www.cervelo.com/en/engineering-field-notes/sensible-frame-fit
@edscoble