Originally Posted by
Kontact
Reach is dependant on head tube height, so it can't be used on its own to determine relative reach. Measuring between a vertical line and a converging line through the headtube is of really limited use.
Yes but no.... Reach is taken horizontally from the BB to the top of the head tube at the centre of the steerer. You can then look at the head tube angle if you want to get more specific, but the reach and stack dimensions are the absolute best ways to compare frames to each other. Essentially, after you are correctly fitted, your saddle position is fixed for height and setback. If you want longer, you need a frame with more distance to the bars i.e. reach, or shorter being the opposite. If you want a higher handlebar setup, higher stack, or lower stack for the opposite.