The Great Wheel Debate 650b vs. 700c Which one is better? Part 2 Rolling Resistance.
This is a long video, but there's quite a lot of information to cover when we compare rolling resistance between 5 different tire choices. If you're not interested in following through the math skip to here for the results: 25:55

Additional reading:
https://vtechworks.lib.vt.edu/bitstre...