While living in Japan, I witnessed an interesting trick for teaching children to ride a bicycle: Remove the pedals. As the child Fred-Flintstones his way around the street on the bike, their body naturally picks up on how to balance a two-wheeler. They can literally pick it up in an afternoon, and be riding with the pedals back on later that day.Latvian design brand Stum has created this Choppy Bicycle specifically for that purpose. I don't think this is a particularly sustainable solution for a family; why buy a bicycle that will only be used for several hours, and never again? It makes more sense to buy a standard bicycle and temporarily remove the pedals for training.That said, I'm writing this up because it might make good sense for a school or daycare center to purchase these. And also because this form is something that would've made the Eameses giddy to see. Note that the seat, which has some natural spring to it, can be placed at one of three heights. The handlebars can be placed in one of two positions, and the bike can be assembled without tools. These run 200 (USD $210).