The invention pertains to a force transmitting device (100) for a transmission (200), particularly of a motorcycle, with a shift assist system, featuring a shift input shaft (30) with a shift lever connection (20) for receiving a shifting motion of a shift lever (300) and a transmission connection (40) for transmitting the shifting motion to a gear shifting gate (110) of the transmission (100), wherein the shift input shaft (30) features an energy accumulator (32) for the intermediate storage of at least part of the shifting force such that the relative motion between the shift lever connection (20) and the transmission connection (40) can be realized by changing the shifting force stored in the energy accumulator (32), and wherein the shift input shaft (30) features a sensor device (60) for detecting the relative motion between the shift lever connection (20) and the transmission connection (40).