Most cyclists chase a higher average speed, but here’s the truth: once you push above 30 km/h, every extra km/h becomes dramatically harder. This is often called the Rule of 30 km/h — and understanding it can completely change how you train. 🚴‍♂️💨 At around 30 km/h, aerodynamic drag becomes the dominant force slowing you down. That means you’re no longer fighting just the road and gravity… you’re fighting the air itself. 🌬️ 👉 Going from 20 → 25 km/h requires a bit more power. 👉 But 30 → 35