That really is good information but all of the wheels tested are compared at a constant 50 km/hr. How many people here will be riding at a constant 50 km/hr? And how many can translate wattage saved to speed gained as compared to a conventional wheel at realistic speeds? The "Bicycling Magazine" tests were conducted several years back when that magazine was more technical than it is now. Their downhill tests were conducted in a controlled environment with several professional riders riding all of the wheels through rotation so that all wheels were ridden the same number of times by all riders. I no longer have a copy of the article but remember that the speeds varied from zero at the top of the hill to, I think, about 35 mph. In other words, real world conditions. The speed gains were all less than 0.5 mph.