Going through some photo archives.
Starting off with the 1975 Midget National Road Race in Milwaukee Wisconsin.
My brother is in the white striped T-Shirt, Green bike, and Orange Skid-Lid. I think at that time hair nets were legal, but the skid lid wasn't, so my parents came up with the bright idea of wearing the skid lid over the top of a hair net helmet.
Unfortunately the bike is long gone. It was a little green bike. Possibly a Gitane. 5 speed. At that time, all "Midgets" (up to 6th grade) were required to ride bikes with 24" wheels. The top riders trained a LOT.
I'll see if more photos show up.