Electric bicycle derailleur control system

An electric bicycle derailleur control system comprising:

• a derailleur including a chain guide to displace a bicycle chain and an electrical actuator operatively coupled to the chain guide to displace the chain guide;
• a detecting device configured to detect information related to a reaction force of the bicycle chain;
• and
• a controller configured to control the electrical actuator so that the chain guide is displaced from a rest position to a first shift position when the detected information indicates a detected chain reaction force being smaller than a first predetermined amount, and so that the chain guide is displaced from the rest position to a second shift position that is further from the rest position than the first shift position when the detected information indicates the detected chain reaction force being equal to or above the first predetermined amount.

An electric bicycle derailleur control system comprising:

• a derailleur including a chain guide to displace a bicycle chain and an electrical actuator operatively coupled to the chain guide to displace the chain guide;
• a torque sensor configured to measure torque of a bicycle component;
• and
• a controller configured to control the electrical actuator to displace the chain guide according to a detected torque of the bicycle component by the torque sensor such that the chain guide is displaced from a rest position to a first shift position when the detected torque is smaller than a first predetermined amount, and such that the chain guide is displaced from the rest position to a second shift position that is further from the rest position than the first shift position when the detected torque is equal to or above the first predetermined amount.