I have a 9 year old boy who loves to ride and race other neighborhood kids. And he'd pretty fast with his BMX bike.

I was thinking that it'll be good for him to go up to the next level in cycling since he's not interested in any other sport(he tried soccer, baseball, swimming, martial arts, golf,etc., without any interest).

How do we go about doing this? Is there any kid's cycling leaugue or something?

And what companies make "serious" kid's road bike or MTB?