That conception was why te Tour de France was raced in fixed gears into the 1930s. Racers felt that derailleurs were inefficient. "The Dancing Chain" provides an excellen account of the difficulties faced by multiple-speed systems in the early years. Tourists embraced gearing long before racers did.
--Eric Norris Sent via iPhone On Nov 20, 2009, at 10:57 AM, Tim McNamara <[email protected]> wrote: > > On Nov 20, 2009, at 9:52 AM, PATRICK MOORE wrote: > >> On Fri, Nov 20, 2009 at 8:38 AM, It Depends <[email protected]> >> wrote: >> Berto's later work suggests much narrower gaps between derailer and >> IGH systems. See http://www.ihpva.org/HParchive/PDF/hp52-2001.pdf >> (noting especially conclusion 2: "Hub gears are generally about 2% >> lower in efficiency than derailleur-type gears. But there are >> exceptions."). > >> Very interesting: apparently, at least on some hubs, direct drive >> is *more* efficient than any gear on a deraileur drivetrain. > > Not really surprising. The derailleur sends the chain through two > jockey wheels which wrap the chain around a tight radius. Those of > us who ride fixed gears (no longer me) have probably noticed we can > swing a bit taller gear in most situations than we'd be comfortable > doing with a derailleur. My guess is that friction losses in wrapping > the chain around the jockey wheels and friction in the jockey > bearings is why. > > -- > > You received this message because you are subscribed to the Google > Groups "RBW Owners Bunch" group. > To post to this group, send email to rbw-owners- > [email protected]. > To unsubscribe from this group, send email to > [email protected] > . > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl= > . > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=.
