New 2016 Raleigh Jazzi 12 Complete Kids Bike General sizing: Fits Children 2-4 Years Old. If you have any questions about sizing, feel free to contact us for more information. Complete bikes will be partially disassembled and sealed in a factory box for shipping. Bikes arrive approximately 85% assembled and will require installation of parts and adjustment of components. If you are not comfortable with bicycle assembly or adjustments, we recommend bringing the the bike to a capable bike shop to be built.