Assistance control method for an electrically-assisted bicycle comprising the steps according to which: A) if the bicycle is in unassisted mode: - (i) a crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (α) corresponding to an activation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of an activation threshold being crossed, the detection system detects the crossing of the threshold and an assistance controlled means activates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in assisted mode; B) if the bicycle is in assisted mode: - (i) the crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (β) corresponding to a deactivation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of a deactivation threshold being crossed, the detection system detects the crossing of the threshold and an assistance control means deactivates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in unassisted mode, in which the assistance activation or deactivation threshold corresponds to a minimum angle travelled of 90 degrees, and more preferentially of 180 degrees. A) if the bicycle is in unassisted mode: - (i) a crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (α) corresponding to an activation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of an activation threshold being crossed, the detection system detects the crossing of the threshold and an assistance controlled means activates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in assisted mode; - (i) a crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (α) corresponding to an activation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of an activation threshold being crossed, the detection system detects the crossing of the threshold and an assistance controlled means activates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in assisted mode; B) if the bicycle is in assisted mode: - (i) the crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (β) corresponding to a deactivation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of a deactivation threshold being crossed, the detection system detects the crossing of the threshold and an assistance control means deactivates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in unassisted mode, - (i) the crankset of the bicycle receives an actuation force in the reverse direction of the direction of advance of the bicycle; - (ii) the crankset performs a rotational travel over an angular range (β) corresponding to a deactivation threshold; - (iii) a detection system detects the reverse rotation of the crankset and the angle travelled; - (iv) in the event of a deactivation threshold being crossed, the detection system detects the crossing of the threshold and an assistance control means deactivates said assistance; - (v) the crankset receives an actuation force in the direction of advance of the bicycle and the bicycle proceeds in unassisted mode,