Probably because they don't make aluminum framed bikes in the US? I suspect it has more to do with what is available. 90% of what I have seen at the plant are Worksman and another brand (and d*mned if I can recall which one it is) with the occasional odd cruiser thrown in. The new trikes were definitely Worksman with solid tires on them I will try and take some pictures next week if I get the chance. Also FWIW the current Pacific Cycles Schwinn Heavi Duti is no comparison to the Chicago built one, name only.

Aaron