I just recently read an article on this here somewhere in BF, using supporting data from a wheel testing lab in Norway.

One of the things the article said was (and I'm paraphrasing) that all other things being equal (AOTBE), higher tire pressure lowers rolling resistance. It also said that AOTBE, greater diameter reduces rolling resistance. The third tidbit I took away was that AOTBE, a narrower tire does not necessarily have lower rolling resistance.

All this apparently comes from the fact that rolling resistance largely depends on the energy "lost" from forward momentum and converted to energy required to deform the tire under load. AOTBE, a tire with higher pressure is more difficult to deform for a given load. That seems pretty intuitive to me.

Have you read something contrary to this explanation, and would you care to share the info? I'm not trying to challenge your comments, rather I'd just to know the truth in this matter.

I actually bought a 100psi Kenda Kwest tire for my Bob Yak years ago partly for this reason.

I googled some terms and this was the first hit (there are probably better examples, but I think this supports the other article findings).

http://www.rouesartisanales.com/article-1503651.html

Down the page is a link to test data. It clearly shows rolling resistance is lower at higher pressure, on all 12 of the 12 tested tires (actually, it shows energy required to spin wheel under test condition is lower on the higher pressure tires).

http://ddata.over-blog.com/xxxyyy/0/...lar-specs.html