new to me photos of Art Smith and his Harley powered Baby Racers that he toured the world with

The #15  above was also in https://justacarguy.blogspot.com/2011/07/balloon-tires-so-big-they-look.html

https://forums.aaca.org/topic/341211-period-images-to-relieve-some-of-the-stress/page/582/