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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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And "eccentric" is usually a term to describe a rotating circular fitting with a detail that's off center. So as the fitting is rotated this detail changes it's position WRT the housing the circular fitting is held within. On bikes this is typically a BB. So as the fitting/eccentric which contains the detail/BB is rotated within the frame shell the chain can be tightened or loosened. Tandems and some single speed bike use this design.
The bike referenced has a curved stay to allow for greater chain clearance. An attempt to reduce chain slap with the stay's top surface. Andy.