Here's an interesting photo of 4 Calfee frames at their shop. Other than tube size and joint layup, note the diffs in headtube config.
Going from left to right:
#1 - a very tall Tetra single; 1.125" steerer w/external headset
#2 - our 2013 Med/Sm Tetra S&S Tandem; 1.5/1.125" tapered headest w/internal lower bearing cup.
#3 - S&S Dragonfly(?) single; 1.125" steerer w/internal cups?
#4 - Dragonfly Pro single; steerer/headset unknown
