Originally Posted by
WheresWaldo
Why did the 48 cm require a setback seat post and the 50 cm didn't? The relationship between your ass and your feet did not change so why would setback change. Cannondale does not change crank size between 48 and 50 cm. If this was just to feel comfortable with the reach to the handlebars, then the 48 cm was really too small! Frame sizing and component sizing should always be based on physiology not on whether or not it was a "good deal."
You are right, that was just stupid.
TLDR; So to play with the reach on the demo bike I adjusted the seat. I know that's the wrong way to adjust the reach, but I didn't want to have them swap the stem, so I played with the seat fore-aft. I didn't really pay too much attention to my leg positions, because I'm sure I can be fitted on both the 48 and 50 and my issue was the reach. When I wrote the 0 setback seatpost I assumed that the 50 has a different seatpost angle, but it doesn't.