Originally Posted by cyccommute

Back your statement up. Where am I wrong? Where is my physics wrong? A dynamo hub introduces drag into the bicycle system to produce light. The magnitude is vary slightly depending on which system you use but it is still there and it is related to the speed of the bicycle. The magnitude of the drag once the light is on falls in a fairly narrow band independent of the quality of the hub. Granted the article from Bicycle Quarterly is 10 years old but I doubt that huge advances have been made to suspend physics since then.

And this isn't about "religion" but about data that can be measured and conclusions that can be drawn from that data.