Wheelchair Moment/ Force Measurements

I am designing a system for a wheelchair treadmill which will allow for real-time measurements of the fraction of effective force for the user’s stroke for a design class. In order to calculate the fraction of effective force, I need to be able to find the moments, however I cannot find any devices which attach to a wheel which produce these measurements. If anyone has any suggestions, please let me know!

cohare7 said, “…measurements of the fraction of effective force for the user’s stroke…”

What does this mean? Can you define this for us and explain in more detail what you are trying to accomplish?

awright