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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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Unless something actually fractures/breaks the failure is usually a slow gumming up of the many pieces movements. Of course this reality is seen through a perception that's not linear.
So, yes a catastrophic failure can and does happen. Impacts increase this possibility. But the vast majority are maintenance related, a lack of lubing the shifter pod or dealing with cables. Andy.