A pedal for bicycles comprising: a pedal-pin which extends along a reference axis, a pedal-body that comprises a hub coupled in a freely rotatable manner on the pedal-pin, an electronic measurement circuit firmly coupled to the pedal-pin to provide electrical measurement signals indicative of the deformation of the pedal-pin, a mechanical clamping member comprising: a first clamping element which is arranged on the pedal-pin to rotate around the reference axis and is positioned in abutment against a shoulder of the pedal-pin in order to be axially clamped along said axis), and a second clamping element that firmly couples the hub to the first clamping element so that the hub is axially clamped to the pedal-pin.