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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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The SunTour guide pulleys didn't have any float designed into them IIRC. So a small amount of off centering (of the pulley under the intended cog) can result in greater chance of chain catch/noise/auto shifting. Replacing that pulley with a float design can loosen up this sensitivity. Andy
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AndrewRStewart