Many years ago, in a long road race, I got in a three-man breakaway in the Cat 4 group. As we were riding our guts out, opening a gap on the main pack, the lead group from a much faster Cat went past us in a smooth paceline, with their deep section aero wheels slicing through the air with a smooth humming sound.
One of the guys I was with looked over at them and said, “So that’s what it looks like.“