Sorry Peter but I disagree: not that many folks will be that interested in a discussion of riding position, but for track, triathlon or time trial positions the seat will be further forward and the body profile flatter, which accounts for the steeper seat and head tube angles of Track/TT/Tri frames to keep the knees aligned over the forward crank position

For a cruiser style bike the key is seat height/front-rear position and the bars are much less important as aero dynamics are much less important than knee and hip stress and numb palms, which affect over 25% of all cyclists are less of a factor with a more upright position that strains the lower back less.

The only constants in the triangle will be that the angles add up to 180, and the seat to bottom bracket length will be very similar smile

Last edited by pugwash; 01/25/09 09:58 PM. Reason: added seat-BB length
It's rarely rocket science, it's usually just math: then again if you can't do the math.......