A paradox: longboards stay calm at 50 km/h, while street skateboards begin violent wobble above 20 km/h. The hardware and dynamics explain the gap. Longer wheelbases, different truck geometry, bigger wheels and deck flex shift natural modes. Stability behaves like a system background daemon, smoothing spikes and damping resonances. This reframes speed design.Longboard Dynamics: Longboards pair lon...More