PHOENIX: Stop No.4 on the USA BMX circuit comes to USA BMXs hometown, for the first outdoor National of the year - at Black Mountain BMX in North Phoenix. With a ton of room for RV parking and camping, many BMX families flock to the Phoenix race, for its great racing and always awesome track. Longtime track operator Debbi Kelly and her crew really know how to put on a show and everybody leaves the Valley of the Sun happy.