A method for operating wheel electronics of a tire checking system includes providing wheel electronics having a battery-free power supply encompassing at least one rechargeable power storage medium for supplying power to the wheel electronics. The wheel electronics can be operated in a reduced-power transmission mode and a subsequent normal transmission mode. In the modes, data that relate to tire-specific parameters and are determined by the wheel electronics are transmitted to a vehicle-mounted communication device in the form of modulated transmission signals, with less transmission power being used for the transmission signals in the power-reduced transmission mode than in the normal transmission mode. Wheel electronics and a tire checking system are also provided.