Nice eye! Leg burns were just part of riding way up into the 70s. Every long term rider I know has a 'pipe burn' on at least one leg, I'm no exception. I have a scar that's over 50 years old!

These bikes weren't what we would call fast today. Even the large displacement bikes made like 25 HP. But they had to be really exciting to ride. I just can't imagine no brakes, but those circle racers were all built that way. Crazy!