Originally Posted by
KerryIrons
Unfortunately these tests are done on steel rollers, not on the road. Results can be skewed by casing compliance. Rene Herse tires are not cheap, but they have a great reputation for lowest on-road rolling resistance.
It doesn't matter that the tests are done on steel rollers. If one tire has less rolling resistance than another tire on a roller it will also have less rolling resistance on the road (any road surface) as well.
Agree with the comments above about the Terra Speed. I have the 700 x 40s on my bike and can maintain pretty damn close to road bike tire speeds with them both on and off the pavement. I chose the tires based on the test results on that website.