Joined: Feb 2012
Posts: 19,320
Likes: 5,428
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
The other common cause of this problem is increasing cable friction. But this usually has the up shift direction (actually up shift is usually the shift to a smaller rear cog, as in shift to a higher ratio gear) being problematic. At the shop when faced with a shifting issue we almost always check the cable/casing friction being so easy to do and frequently lube the cable anyways. Andy.