System to measure pushrim propulsion dynamics in wheelchairs

A system, comprising

• a wheelchair comprising a first wheel comprising a first pushrim and a second wheel comprising a second pushrim;
• and
• a first device for measuring pushrim dynamics in operative connection with the first wheel and a second device for measuring pushrim dynamics in operative connection with the second wheel, each of the first device and the second device comprising:
• a plurality of beam sensing elements configured to be placed in operative connection with the first pushrim and the second pushrim, independently,
• a sensor system comprising one or more sensors in connection with each of the plurality of beam sensing elements to measure bending of the beam sensing element;
• a modular hub comprising a mounting base, the mounting base comprising beam sensing element connectors to attach each of the plurality of beam sensing elements to the mounting base to extend radially from the mounting base in a predetermined spaced relation, an inner hub flange configured to be removably connected on an inner side of the mounting base, and an outer hub flange configured to be removably connected on an outer side of the mounting base, each of the inner hub flange and the outer hub flange being configured to be operatively connected to the first wheel and the second wheel of the wheelchair, independently, each of the mounting base, the inner hub flange, and the outer hub flange independently comprising a passage therethrough via which a hub axle can be passed.