I just noticed a design difference too! On the 26 x1 3/8" wheeled bike in the picture, the upper stays
dead end at the seat tube. On my Arraya wheeled 27 x 1 1/4 models, they straddle the seat clamp area
and are slash cut. Of course these have no seat tube clamp. It uses a sliding nut in a slotted aluminum
seatpost. A steel rod insert holds it stiff in the top for clamping the seat. An allen head bolt below the
stays is the only visible post holding device. It works very well.,,,,BD