On a correctly fitted bike, at the bottom of the pedal stroke the participant's knee should be:

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On a correctly fitted bike, at the bottom of the pedal stroke the participant's knee should be slightly bent. This indicates a correct saddle height. If the saddle is too low, the participant risks injury as the knee and ankle may twist at the bottom of the pedal stroke. If the saddle is too high, the participant will pedal inefficiently, and may 'rock' back and forth in the saddle, risking back and hip injury. If the knee turns outwards or inwards, the saddle is too low.

On a Correctly Fitted Bike, at the Bottom of the Pedal