A bicycle suspension system includes a control unit, a velocity sensor, and a cadence sensor. The control unit is configured to obtain gear ratio information of a bicycle to control an operating state of a suspension of the bicycle based on the gear ratio information. The velocity sensor is configured to detect a forward velocity of the bicycle and output a signal indicative of the forward velocity to the control unit. The cadence sensor is configured to detect a cadence of the bicycle crank and output a signal indicative of the cadence to the control unit. The control unit is configured to obtain the gear ratio information based on the forward velocity and the cadence.