Bicycle brake and method for constructing the profile of a surface portion of a lever of said brake

A method for constructing a profile of a surface portion of a lever of a bicycle brake, said surface portion coupled, through rolling contact, to a coupling roller pivoted on a first lever of the bicycle brake, said first lever rotating about a first rotation axis (X1) to impart to said surface portion a rotation about a second rotation axis (X2) parallel to said first rotation axis (M);

• said method comprising the following steps:
• providing said first lever;
• imparting to said first lever a predetermined number of rotations about the first rotation axis (X1) rotating, on each occasion, the first lever by a respective predetermined angle of rotation;
• tracing a curve that passes by a predetermined number of points of the roller, each of said points being defined as function of the position taken by the roller during a respective rotation of the roller about the first rotation axis (X1) by a respective predetermined angle of rotation and about the second rotation axis (X2) by a respective angle substantially equal to said respective predetermined angle of rotation;
• constructing a second lever including said surface portion with said profile following the curve.

A bicycle brake comprising:

• a first lever pivoted in a first rotation axis (X1) and having a first actuation arm for connection to an inner cable of a sheathed cable and a first braking arm for supporting a first brake pad;
• a second lever pivoted in a second rotation axis (X2) parallel to the first rotation axis (X1) and having a second actuation arm for connection to a sheath of the sheathed cable and a second braking arm for supporting a second brake pad;
• the first lever and the second lever each formed as a unitary body;
• a roller that is pivoted to one of said first lever and second lever and is in rolling contact with a surface portion formed directly on the other of said first lever and second lever;
• wherein said surface portion of the other of said first lever and second lever has a curved profile selected to provide a substantially equal braking force from the first braking arm and the second braking arm to a respective braking track associated with the first braking arm and the second braking arm.