Quote:
Originally Posted by dcb
Even the worlds record distance in 24hrs guys use a derailleur, if ever efficiency was a concern
![](http://www.adventuresofgreg.com/images/gears.jpg)
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And that's a purpose-built bike that's going to be operated indoors, on a level track, at constant speed for many hours.
If there ever was an application for a single-speed, this was it.