They are fashion in Thailand, there are hundreds of litlle bike repair shops selling them, all sorts of colours are available, they just buy the rim and spokes, then lace them to the original hubs, there seems to be some sort of competition on who can get the narrowest tyres,
some of the scoots look gay others look kind of cool
They are generally called "wan" wheels and get there name from the racing "wan boys." The style is up to you if you like it, but they are actually good for adding some speed, better gas mileage, and make turning super quick and more sporty. Can get them at most shops around here in every color you can think of like bikejunkie mentioned.