Definition: A vehicle with two wheels tandem, handlebars for steering, a saddle seat, and pedals by which it is propelled.
Phonological development: The girl at age 5 (above) signs somehow a bit wider than when she was 6 (below).
Signed at age 6;3.
A four-year-old girl Juli first learned how to ride a bicycle without support.
A drawing of herself and her mother riding on their bicycles by Juli at age 4;7. The picture includes the blue sky, the sun, and the rainbow. The cyclists wear the helmets, too.