Data Processing Device and Computer-Implemented Method for Synchronized Shifting of Bicycle Gearboxes, Bicycle Gearbox and Method of Operating the Same

A data processing device (104) for controlling a gear change in a bicycle gearbox (4) for a bicycle (1) with or without an auxiliary motor (2), in particular a bottom bracket gearshift device and/or a hub gear, from one engaged gear (100) directly into another gear (102) to be engaged by automatic actuation of a first clutch actuator (42) and at least a second clutch actuator (64), wherein the data processing device (104) is configured:

• to receive at least one switching parameter (112) representative of a current state of the bicycle gearbox (4);
• and
• to output an actuation signal (120) for actuating the first and the second clutch actuator (42, 64) depending on the at least one switching parameter (112) and a gear change signal (106) representing a command for a gear change:
• wherein the actuation signal (120) contains control data (250, 252, 254, 256) which are representative
• of points in time in the future at which the first clutch actuator (42) and/or the second clutch actuator (64) will have executed or are to execute a switching movement (49, 73) required for the gear change, and/or
• of a time interval between the actuation of the first clutch actuator (42) and the actuation of the second clutch actuator (64) and/or
• of a switching speed of the first clutch actuator (42) and a switching speed of the second clutch actuator (64).