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Related Experiment Videos

A pedal dynamometer for off-road bicycling

T Rowe1, M L Hull, E L Wang

  • 1Department of Mechanical Engineering, University of California, Davis 95616, USA.

Journal of Biomechanical Engineering
|July 24, 1998
PubMed
Summary
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This study developed a modified dynamometric pedal for accurate measurement of bicycle pedaling forces. The design maintains original functionality and achieves high accuracy, suitable for analyzing rider and inertial loads during cycling.

Area of Science:

  • Biomechanics
  • Sports Engineering
  • Instrumentation

Background:

  • Accurate measurement of pedaling forces is crucial for understanding cyclist biomechanics and optimizing performance.
  • Existing methods may not capture the full spectrum of forces experienced during dynamic cycling conditions, especially off-road.

Purpose of the Study:

  • To design and evaluate a dynamometric pedal capable of measuring two pedal force components in the bicycle's plane.
  • To adapt a commercial clipless pedal for accurate force measurement without compromising its original form or function.
  • To assess the accuracy and performance of the modified pedal under various loading conditions.

Main Methods:

  • Modification of a commercial clipless pedal by replacing the spindle with an instrumented one featuring eight strain gauges.

Related Experiment Videos

  • Integration of strain gauges into two Wheatstone bridge circuits for load component measurement.
  • Static calibration and accuracy checks were performed, including evaluation under applied and unmeasured load components.

    • Main Results:

    • The dynamometric pedal demonstrated root mean square errors of less than 1% full scale (FS) for measured force components.
    • Errors due to unmeasured load components were less than 2% FS.
    • The system exhibited a natural frequency greater than 135 Hz with a 75 kgf load, indicating high dynamic capability.

    Conclusions:

    • The developed dynamometric pedal is accurate and robust, suitable for measuring both rider muscular action and inertial loads.
    • Its design preserves the original pedal's form and function, making it practical for real-world cycling applications, including off-road.
    • The demonstrated performance validates its use for detailed analysis of cycling dynamics and rider-surface interactions.