I am building a Guerciotti junior racer bike for my daughter. I picked the frameset up at the Cirque swap meet. I have a set of 600c clincher rims, a set of 600c tubes, but only one clincher tire, which happens to be a Wolber. I've also located a set of "Juniores" sew up tires which are 24". I'm looking for another 600c clincher tire, or a pair of 24" sew up rims. I don't know if 24" is a similar size to the 600c or not. I could also use a short throw crank, like 150mm or so. I've got a 150mm Zeus but it is made for a single. There was a junior crank made by Gipiemme called the Bambino. I would appreciate anyone's help or suggestions.