Originally Posted by
Road Fan
I completely agree with doing a physics-based test that attempts to minimize sources of load that cannot be easily modelled. But there are still two critical parameters:
What is the mass of your bike with all included? - need a good scale
How high is the hill?
Just sayin', but if you want to nail "what is the real power?" you also need to nail the mass or weight, and the height of the hill.
Step on a scale that you've calibrated, but getting the hill's actual height can be a challenge. Best if it's been surveyed, and I've considered measuring the angle with a plumb bob and protractor (knowing distance) but just using GPS or an altimeter should get a good approximation.