Originally Posted by
Iride01
Kontact I still feel safer saying that because the seat tube angle changes that the saddle might not be at the same distance from the vertical axis off of the BB. I'm not going to assume that because the head tube angle and other things change too that simply measuring from the bars to the saddle will give the same setback.
But I can only assume from you wishing to say I'm wrong that you must think it will always be at the proper setback no matter what bike or model or size. Or do you actually measure to put the saddle the same distance back from the vertical axis of the BB?
I don't know if I'm following you. Why would you try to get setback from the stem?
I use the vertical axis off the BB to set setback every time. With a ruler and a plumb line it is quick and easy to do.
After saddle height and setback are done it is much easier to get the bars in place.
The reason I don't follow the stuff you mention about the frame angles is that there aren't any real reference points on the frame that are useful. Even seatpost clamps vary too much in design to use as good references.
This isn't personal and I don't need to prove you wrong.