As Jan Heine has often pointed out, his methodology is significantly different than that of most tire manufacturers. Despite that, what I get reading the article you linked to seems fairly consistent with what I think Jan has written.
1) All other things being equal a tire with lighter more supple structure will have less rolling resistance. 2) All other things being equal a wider tire will have lower rolling resistance than a narrower one. 3) For a given tire increasing pressure reduces rolling resistance (on smooth surface or neglecting suspension losses), but at very low pressure this change is larger than at higher pressures, and as pressure increases the effect becomes negligable. Though neither Jan nor Schwalbe seem to mention this, I was once told by a tire engineer that if you increase tire pressure enough the rolling resistance increases. His explanation for this was that vertical compression losses in the contact patch (and or road bed) became larger than the bending losses. 4) In practice a more compliant tire saves energy because less vibration/shock is transmitted to the rider. Jan calls this suspension losses and includes it in his definition of rolling resistance. Schwalbe leaves this component out of their enumeration of loss types at the head of the article, but they allude to it in the last sentence of the section titled "why do pros ride narrow tires if wide tires roll better?". On Saturday, January 4, 2014 4:46:07 AM UTC-8, Charlie wrote: > > http://www.schwalbetires.com/tech_info/rolling_resistance#why > > Another view on tire performance. > > Guess they do not use the same hill that Mr. Heine uses, or the same type > of testing. > > Charlie Petry > > Snow riding today in > Jennersville PA > > > > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
