24" dirt jump suitable

I'm looking for suitable bikes for my 2 boys. They are extremely hard on gear and can break stuff like a wrecking crew. With that having been said, I'm looking for a 24" wheeled dirt jump style STP/P1 type with a single chain ring and a rear cassette derailer so they can ride the trails a little easier. I would love to just get them 24" mountain bikes and Keep their BMX bikes but I just don't have room for all that. Maybe Jay could build a 24" frame EWR that would solve this. Then you could race the cruiser class at the BMX track. So if any of the great bike minds have any suggestions I would apreciate them. :thumbsup: