Abstract: What is disclosed is a drive device for a bicycle driven by an electric motor, having a main frame having a swing arm bearing, and a rear linkage element arranged at the swing arm bearing. The drive device has a pedal crank as a first drive for providing a first drive force, having a first drive shaft, a center electric motor as a second drive for providing a second drive force, and an output element having an output shaft, configured to receive the first and/or second drive forces and transfer same to the bicycle wheel to be driven. The center axis of the output shaft is radially distanced from the center axis of the first drive shaft and the output shaft is arranged relative to the swing arm bearing such that a radial distance between the center axis of the swing arm bearing and the center axis of the output shaft is smaller than a radial distance between the center axis of the swing arm bearing and the center axis of the first drive shaft.

Abstract: What is described is a portable multifunctional tool having a handle portion and a tool accommodating portion having a tool function element arranged thereon configured to actuate a quick release chain fastener having two chain link plates and two chain link plate connection members. The tool function element has a first force exertion unit configured to exert a force on the first chain link plate connection member of the quick release chain fastener, and a second force exertion unit configured to exert a force on the second chain link plate connection member of the quick release chain fastener. The first force exertion unit and the second force exertion unit are translationally movable in relation to each other so as to actuate the quick release chain fastener by means of said translational movement.