I think my first introduction to cycling aerodynamics came in around 2015. I'd recently picked up road cycling after racing mountain bikes in my youth, and I'd decided to enter the local 'Exeter Wheelers Wednesday night Club 10' time trial.
As I reached down to take my bottles out of my cages at the race HQ (read: random village hall), a friend stopped me and repeated a hand-me-down axiom that claimed empty bottle cages were slower than simply carrying your bottles.
