Bicycle suspension system

A bicycle suspension system comprising a chassis called a frame,

• a front fork supporting the axle of the hub of a front steerable wheel,
• a first damper called the front damper,
• a swing arm articulated on the frame, supporting the axle of the hub of a rear drive wheel and a damper the ends of which are secured respectively to the frame and to the swing arm,
• wherein the drive torque is transmitted to the drive wheel by a chain extending between a drive pinion secured to the frame and a driven pinion secured to the axle of the hub of the drive wheel,
• at least one sensor called an impact sensor capable of determining the running over of an obstacle by the steerable wheel and/or the drive wheel, said sensor being connected to a monitoring unit operating the front damper and/or rear damper as a function of the signal transmitted by said sensor,
• wherein the front damper and/or rear damper is a variable-compression damper comprising at least three positions, an open position in which the compression is maximal, a closed position in which the compression is zero and a medium position,
• at least means for detecting pedaling, called pedaling sensors connected to the monitoring unit which, when no pedaling is detected by the pedaling sensor, sets the compression control of the damper in the open position and, when pedaling is detected by the pedaling sensor, sets the compression control of the damper in one of its three positions, open, closed or medium, as a function of the impact-detection signal.