Originally Posted by
deapee
Explain why 3 degrees off center would be *amplified* to more than 3 degrees at the saddle.
Three degrees wouldn't, but half a millimetre would. Guess I didn't explain it very well, so to put it another way: for me it's harder to notice a 3 degree error by looking at the seat post markings in relationship to the seat tube slot, than by looking at the saddle in relationship to the frame.