I remember that as a kid well!
Cars look sleek!
DL, I thought I had learned all the "tricks" over the years, but actually shaving down the wheels was not one of them,
innovating! 👍
Big "thing" back in the early 70's was graphite powder. Every kid and the floor of the building was covered with that stuff.
Growing up in a town full of nuke scientist and rocket surgeons meant tough competitions and a few illegal mods.