Drive train and sprocket arrangement for human-powered vehicle

A drive train for a human-powered vehicle, comprising:

• a drive unit including a motor configured to impart propulsion to the human-powered vehicle;
• a sprocket arrangement operatively coupled to the drive unit, the sprocket arrangement comprising a first front sprocket, a plurality of rear sprockets and a plurality of gear ratios respectively corresponding to the plurality of rear sprockets, the plurality of gear ratios including a largest gear ratio and a smallest gear ratio;
• a total gear range quotient obtained by dividing the largest gear ratio by the smallest gear ratio, the total gear range quotient being equal to or larger than 7;
• the motor being provided adjacent to the first front sprocket;
• the sprocket arrangement including at least one individual sprocket-space provided between two adjacent rear sprockets among the plurality of rear sprockets;
• the two adjacent rear sprockets being adjacent to each other without another rear sprocket therebetween in an axial direction with respect to a rotational center axis of the plurality of rear sprockets;
• and
• a force-transmission coefficient obtained by dividing the total gear range quotient by a total number of the at least one individual sprocket-space being equal to or larger than 0.97 and being equal to or smaller than 1.36.