System for generating electrical energy in a rolling wheel of a vehicle, comprising • an energy converter for generating electrical energy in a rolling wheel of a vehicle by utilizing the elastic deformation of the wheel between the driving plane and the central axis of the wheel, and • a support structure (17, 20) configured to hold the energy converter in a fixed arrangement about the central axis of the wheel, wherein the energy converter comprises • a lever element having a cantilever rotatably mounted about an axis of rotation, wherein the lever element is configured for such an arrangement in a wheel for a vehicle that ∘ a deformation of the tread towards the central axis of the wheel generates a force acting on a contact surface of the cantilever, and ∘ the force acting on the contact surface causes a rotary movement of the cantilever in a pumping direction of rotation about the axis of rotation, • a freewheeling rotary coupling configured for coupling depending on the direction of rotation, comprising a coupling direction for establishing an acting coupling and a freewheeling direction, and • an electrical generator having a rotor and a stator, wherein the electrical generator is configured to convert kinetic energy of a rotation of the rotor into electrical energy, wherein • the lever element, the freewheeling rotary coupling and the electric generator are arranged and configured in such a way that the rotary movement of the cantilever in the pumping direction of rotation is transmitted via the freewheeling rotary coupling in the coupling direction onto the rotor of the electric generator and is converted into electric energy by the electric generator, characterized in that • the system comprises a plurality of energy converters, and • the support structure (17, 20) is configured to fix the plurality of energy converters in an annular uniform arrangement. • an energy converter for generating electrical energy in a rolling wheel of a vehicle by utilizing the elastic deformation of the wheel between the driving plane and the central axis of the wheel, and • a support structure (17, 20) configured to hold the energy converter in a fixed arrangement about the central axis of the wheel, wherein the energy converter comprises • a lever element having a cantilever rotatably mounted about an axis of rotation, wherein the lever element is configured for such an arrangement in a wheel for a vehicle that ∘ a deformation of the tread towards the central axis of the wheel generates a force acting on a contact surface of the cantilever, and ∘ the force acting on the contact surface causes a rotary movement of the cantilever in a pumping direction of rotation about the axis of rotation, ∘ a deformation of the tread towards the central axis of the wheel generates a force acting on a contact surface of the cantilever, and ∘ the force acting on the contact surface causes a rotary movement of the cantilever in a pumping direction of rotation about the axis of rotation, • a freewheeling rotary coupling configured for coupling depending on the direction of rotation, comprising a coupling direction for establishing an acting coupling and a freewheeling direction, and • an electrical generator having a rotor and a stator, wherein the electrical generator is configured to convert kinetic energy of a rotation of the rotor into electrical energy, wherein • the lever element, the freewheeling rotary coupling and the electric generator are arranged and configured in such a way that the rotary movement of the cantilever in the pumping direction of rotation is transmitted via the freewheeling rotary coupling in the coupling direction onto the rotor of the electric generator and is converted into electric energy by the electric generator, characterized in that • the system comprises a plurality of energy converters, and • the support structure (17, 20) is configured to fix the plurality of energy converters in an annular uniform arrangement.