Device for regulating tyre pressure

Method for automatically regulating the pressure in gas-filled tires of an agricultural vehicle that has at least one tire pressure regulation system (6) with at least one control unit (20). The pressures of the tires are adjusted according to the weight of the vehicle. Independent claims are also included for the following:- (a) a device for automatic pressure regulation of gas filled tires of an agricultural vehicle and; (b) a method for automatic pressure regulation of vehicle tires in which the pressure may be temporarily dropped below a critical value, before being increased again.