Bicycle front deraileur with a smooth gear switching mechanism

A bicycle front derailleur, operated by pulling a wire and shifting a chain between a large sprocket, a medium sprocket and a small sprocket, which are arranged on a common axis, defining a horizontal axis, said bicycle front derailleur comprising:

• a chain guide for shifting said chain between said large sprocket, said medium sprocket and said small sprocket;
• chain guide moving means, connected to said chain guide, for moving said chain guide so as to shift said chain;
• and
• a cam lever pivotably connected to said chain guide moving means at a pivoting point for pulling said chain guide moving means when said wire is pulled in a pulling direction:
• wherein said cam lever has a cam groove formed on a peripheral surface of said cam lever for receiving said wire, with each point in said cam groove defining a radial distance from said pivoting point;
• further wherein said cam lever is structured such that said radial distance between said cam groove and said pivoting point increases in a direction opposite of said pulling direction, so as to provide a greater effective length vertical to said pulling direction when said wire is subject to a greater linear displacement resulting in a greater counterforce.