Wytze says that “it is maintenance free, it has an efficiency of 96% (compared to 98% chain efficiency). It works.” The hole in the bottom bracket is visually striking, but it had another purpose in the design; “it is the legacy of the idea to give the customer the option to fit the bike aftermarket with an electric pedal assist.
http://bicycledesign.blogspot.com/2009/11/cannondale-dutchess-follow-up.htm
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