Originally Posted by prj71 (Post 22529482)

All the work has been done for you already.

https://www.bicyclerollingresistance.com/

Continental TerraSpeed 700 x 40 roll pretty good on the road and gravel.

Originally Posted by prj71 (Post 22529482)

All the work has been done for you already.

https://www.bicyclerollingresistance.com/

Continental TerraSpeed 700 x 40 roll pretty good on the road and gravel.

Originally Posted by KerryIrons (Post 22530501)

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.

Originally Posted by KerryIrons (Post 22530501)

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.

Originally Posted by KerryIrons (Post 22530501)

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.

Originally Posted by prj71 (Post 22532345)

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.

Originally Posted by Atlas Shrugged (Post 22532555)

I would question that logic as the variables could affect the resistance in a non-related fashion. As an example, a fast car such as a Porsche Turbo would not be the fastest car if a travel trailer was attached when compared to another performance vehicle such as an AMG E63 wagon. How would a solid rubber tire or hyper-inflated tire perform on their tests? A tire specifically tuned to perform well in real-world conditions might perform poorly on the static rolling drum test.

Originally Posted by Atlas Shrugged (Post 22532555)

I would question that logic as the variables could affect the resistance in a non-related fashion. ... A tire specifically tuned to perform well in real-world conditions might perform poorly on the static rolling drum test.

Originally Posted by RChung (Post 21879408)

... So, back then, we were *exactly* occupied with this question of the agreement or disagreement between roller and field tests. We were 100% concerned that roller tests were not realistic, and we were hoping to use field tests to prove that roller tests were inadequate. Most of this stuff was just presented and discussed and analyzed and shared on the Slowtwitch Forum. Here's the part you're not gonna like, and I don't really like it either: if you go to Slowtwitch and search the forum for posts by any of us with subject headings like "roller Crr" or "roller vs. field test" or variants of that, you'll see the discussions. So, you can look up the discussions -- they're still there, including the descriptions of what we found and discussion and arguments, but you'll have to read through a bunch of scattered posts to find where we concluded that *we were wrong* and the rank ordering of roller and field tests is almost always preserved. Look in the time frame around 2008 or 2009 or so.

Second, more to your purposes, we were racing, so almost all of our tests (except for a couple of tests of training tires) were for racing tires, and those were tires that we either personally owned or were sent to us for testing -- remember, I said none of us work in the industry. So, altogether, there were maybe a a dozen of these joint tests until we got tired (!) of doing them -- field testing is a lot more time intensive than roller testing and none of us were getting paid for it (cuz we're not in the industry) so once we saw that relative rankings hardly ever changed, we stopped that unless there was a really good reason. I was happy and relieved for that....

Originally Posted by PeteHski (Post 22532584)

Anyone else struggling with this analogy? Or is it just me?

Originally Posted by Atlas Shrugged (Post 22532654)

Upon a re-read, I missed the mark on that one! I will leave the analogies to others going forward. The point I was trying to make was just because a tire performs really well on the drum test does not necessarily correlate to conditions out on the road.

Originally Posted by Atlas Shrugged (Post 22532654)

Upon a re-read, I missed the mark on that one! I will leave the analogies to others going forward. The point I was trying to make was just because a tire performs really well on the drum test does not necessarily correlate to conditions out on the road.

Originally Posted by rekmeyata (Post 22532933)

I think the Gravelkings you listed are your best bet, they are rated high in that rolling test site, but you can Goggle reviews about the Gravelkings, and anywhere you look they have high reviews, plus they are less expensive than some other brands.