Cyclists have a dominant leg. In most riders, one leg produces more peak force during the power stroke — the downward push from roughly 12 o'clock to 6 o'clock. The dominant leg is stronger. This has been measured consistently across recreational and competitive cyclists.
The dominant leg also produces less net positive power per revolution. The leg that pushes harder during the downstroke also resists more during the upstroke — it pushes down when it should be lifting, creating negative work that the other leg must overcome. The net contribution — positive work minus negative work — is lower for the dominant leg than for the non-dominant leg.
The non-dominant leg compensates differently. It produces less peak force but better-timed force — contributing positive work through more of the revolution and negative work through less of it. The coordination, not the strength, determines the net contribution.
This means that the asymmetry cyclists feel — “my right leg is stronger” — is real but misleading. The stronger leg is less efficient. The asymmetry in peak force creates an asymmetry in timing that partially cancels the strength advantage. Training to equalize peak force between legs would miss the point: the goal should be equalizing coordination patterns, not force magnitudes.
The dominant leg does more work in total — more positive work and more negative work. It is more active but less productive. Strength and productivity are not the same axis, and optimizing for the one you can feel (force) can obscure the one that matters (net contribution).