Cycle pedal

Cycle pedal comprising a pedal body (1) constituted of a globally rectangular horizontal plate (2) fitted on its upper surface with means for locking (5, 6) a cyclist's shoe (8) and on one of its longitudinal edges a case (3) containing a pedal pin (4) designed to be fixed to the free end of a crank (41) characterised in that the plate (2) is secured to the case (3) so that its upper surface extends beneath the pedal pin (4) along a distance a and the support axis (7) of the shoe on the pedal plate (2) which merges with the front plate passing through the metatarsus of the cyclist's big toe when the latter is pedalling, extends in front of the pedal pin (4) along a distance b so that the pedal support axis (7) describes a circular curve with centre O′ and radius r′ offset from a downwards and from b forward relative to the circular curve of the pedal pin (4) with centre O, where O′ is the axis of the cycle bottom bracket shell and of radius r and in that the means for locking (5, 6) comprise, on one hand, a front interlocking mechanism (5) designed to co-operate with the front part of a clip 9) integral with the sole (10) of the cyclist's shoe (8) and, on the other hand, a movable rear interlocking mechanism (6) designed to co-operate with the rear part of the clip (9) of the shoe (8), the movable rear interlocking mechanism (6) being movable under the pressure of the rear part of the clip (9) of the shoe (8) from a position called interlocked, and passing through an open position allowing to insert or remove the rear part of the clip (9) of the shoe (8), until returning to the interlocking position under stress from an elastic means (20).