Originally Posted by
waynesulak
A tandem with one power meter that measures the captain's power at the crank or pedals would be enough to measure the efficiency difference between chain and belt. Captain with no stoker climbs a course at constant speed with belt installed. Replace belt with chain and repeat. Compare power required.
Captain sans stoker introduces variability and thus doubt. Maybe stoker power and weight affects efficiency. No point to going to the trouble of the experiment without a definitive result.
Besides, a crank-based captain's powermeter would need be reversed if on left sync spider, and the stoker crank couldn't be a triple and might be affected by power from the captain. So, for practical purposes, tandem powermeters await the pedal-based solution. Polar/Looks are available now, but these are way expensive and not ANT+.
Finding a 135 mm OLD road wheel with a PowerTap hub would not be easy. Would I be able to use a 130 mm hub road wheel with a spacer?