The present invention provides a bicycle comprising front and rear wheels and a frame including a main frame having a head tube and a top tube secured to the head tube at an intersection spaced from an upper end of the head tube. The roller blind web can be wound up at least at one end by a winding device to form a roller blind winding having a geometrical center axis. The present invention makes possible the efficient utilization of alcohol fuels in an internal combustion engine to generate electrical or mechanical power such as in vehicular applications. A destination is selected based on confidence rating and displayed. The memory contains software for processing data received by the circuit and instructions for executing a validation sequence, making it possible to form a data flow representing a flow received by the circuit in normal operation, to compare data contained in registers of the circuit with theoretical values and to supply a signature representing a result of these comparisons.