Joined: Feb 2012
Posts: 19,318
Likes: 5,427
From: Rochester, NY
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
A fraying apart cable can certainly jam up the shifter spool's movement as well as hinder the cable's movement through the pathway from the spool to the housing. Many shops (and Shimano) suggest replacing the rear shift cable every year as a precaution form the broken off end becoming trapped in the shifter (and the entire lever being replaced, you do the math). Andy
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AndrewRStewart