would the lawn be ok for you. whats the difference between the dirt bike and riding a bmx bike on the street. if the throttle stop is on then speed is not an issue. can fall off a bmx bike just as easy.. weight issuse, yes.but with a bmx bike most kids don't wear protective gear. my kids and the neighbor kids ride up and down the street all the time. we don't live next to a riding spot. it takes 1& 1/2 hrs to get to a spot to ride.
maybe were gettng them ready for supermoto.. they ride on the street