Interestingly that is pretty much in keeping with the traditional rolling resistance tests done in tire labs. The decrease in rolling resistance "flattens out" as inflation pressure increases. Even on a steel roller, an increase from 100 to 140 psi doesn't reduce rolling resistance that much. Interestingly in the old Avocet tests, that flattening was more pronounced in tubulars than in clicnhers. Those were also- as far as I know- the first published tests hinting at lower RR with wider tires.
Tire pressure needs to be high enough to prevent pinch flats. At my weight (6'4" and roughly 220 lbs these days, more in midwinter when I am not riding due to snow, ice and cold) I pretty much have to run tires 32 mm or narrower at the top end of the rated pressure on the rear, and run the same at the front for no particular reason. At 23 mm I have to run them at 120 psi or lose weight... ;-) Interestingly enough the comfort of my 559x32 Paselas at 100 psi is very similar to my 700x25 Paselas at 115. > On Jan 5, 2014, at 7:29 AM, Jan Heine <hein...@earthlink.net> wrote: > >> On Saturday, January 4, 2014 10:59:41 PM UTC-8, ted wrote: >> Are you equating the behavior of high performance 32mm clinchers and 25mm >> tubulars, or are both tires you mention clinchers? > > I am just talking about test results. We tested the Grand Bois clinchers, as > well as the Vittorias as clinchers and tubulars at a multitude of pressures. > The results were the same - ultra-high-pressures don't provide any benefit, > even on very smooth roads. For more information, I recommend you read the > original article - there are dozens of pages on tire performance in that > issue (Vol. 11, No. 3), much more than I can summarize in this format. > > Jan Heine > Editor > Bicycle Quarterly > www.bikequarterly.com > > Follow our blog at www.janheine.wordpress.com > -- > 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. -- 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.
