Question: what is the best size dirt bike for a 10 year old?
Answer: For a 10-year-old, the dirt bikes that I recommend for an average kid just wanting to have fun and not race seriously is either the Honda CRF110F, the Yamaha TT-R110E, or the Kawasaki KLX110. These three models are a good size for a 10-year-old and are priced reasonably.