Would you classify these vehicles in the Derringer Bespoke collection as motorized bicycles? Mopeds? Miniature motorcycles? The classification is unknown (to me) but their design is phenomenal - based on the racing bikes of the 1920's and each custom built they exude a nostalgia that's hard to deny. There's a nice writeup on the technical specs of the bikes here and several great galleries of the different styles here, here and here.

I've never considered myself much of an enthusiast in this realm of transportation but I'll admit to being quite smitten with what I'm seeing.