Schwalbe's graph is nice, but unfortunately, it's an ancient graph that has long been debunked. While it shows wider tires rolling faster, it also suggests that very high pressures make tires roll faster. That simply isn't true. We've used several different methods to confirm our initial results that going to very high pressures doesn't gain better performance.
The Schwalbe data probably stems from a test on a steel roller. Without a rider, you don't measure the suspension losses that occur in the rider's body, and so you get only half the resistance. As tire pressure increases, the bike vibrates more, which increases the suspension losses and cancels out any gain from reduced flex in the tire casing. More about suspension losses is here: http://janheine.wordpress.com/2012/08/12/suspension-losses/ Jan Heine Editor Bicycle Quarterly www.bikequarterly.com Follow our blog at http://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.
