The core of FROG lies in the mechanical precision of gravity sensing. Jose Vinaroz completed a complex physical integration within an extremely compact PA framework. We have compressed three distinct braking logics—L (Load braking), U (Unload braking), and N (Neutral/No braking)—into a tiny red toggle at the base. Through this three-stage mechanical system, the wheel set gains the physical intuition to distinguish between a user’s sitting and standing states. This hardcore solution, which converges multiple controls into a single component, completely eliminates the need for early, cumbersome external pedal interventions. Using the most restrained structural variables, it establishes a precise order of intelligent feedback deep within the chassis.