We get a great many emails from parents asking if we teach kids to ride a bike and we do not (may be we should - food for thought) but here is a great video on how to tech a child to ride a bike from our friends at BikeRadar.
http://www.bikeradar.com/beginners/news/article/how-to-teach-a-child-to-cycle-in-30-minutes-37033/
http://www.bikeradar.com/beginners/news/article/how-to-teach-a-child-to-cycle-in-30-minutes-37033/