Summary:
Long-distance fatigue is rarely just a matter of time in the saddle. The real culprits are usually ergonomic: a poorly shaped seat that creates pressure hot spots, a smooth tank that makes your thighs work constantly to hold position, bars that pitch your weight forward, and pegs that lock tension into your lower body. Riders who understand how these contact points interact can diagnose their fatigue earlier and fix it more effectively without switching bikes.