A bicycle sensor device of the type not having Internet accessibility and comprising at least one sensor element adapted for registering data regarding the bicycle, a data storage unit adapted for storing registered data regarding the bicycle, a processor element adapted for generating an output of the sensor device, and a transmitter element adapted for transmitting by short range communication an output of the sensor device to an external device being adapted for displaying the output of the sensor device to a user. The processor element is configured to cause the transmitter element to transmit the output of the sensor device to an external device in one of a first mode, a second mode and a third mode. The first mode is a normal operation mode, the second mode is a service request mode, and the third mode is a data transfer mode.