The invention concerns a crankarm of a crankset comprising a first portion rigidly connected to a crankset and forming a recess, a second portion that inserts into the recess via a first opening in the first portion, the second portion being able to move relative to the first portion in a straight translational movement, means controlling the movement of the second portion relative to the first portion in order to produce a maximum elongation of the crankarm in the push phase of pedalling and a minimum elongation of the crankarm in the pull phase of pedalling. The recess of the first portion comprises a second opening allowing one of the ends of the second portion to exit the recess.
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