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Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,147
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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Many of the DA guide pulleys I have serviced (during what we call a deluxe tune up, a drivetrain cleaning on top of the usual tune) have a unique dual ball bearing with float. The Ultegra and below groups use a bushing. Ceramic for the better groups (below DA) and steel bushings for the lower grade ones. The steel wears fastest, ceramic less so and the DA ball bearinged version lasts a lot longer. (classic getting what you pay for). All this is independent on riding conditions and maintenance manors. Andy
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AndrewRStewart