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 first thing I think of is cable tension and or friction. The next is chain and cassette condition, any link or tooth damage or looseness. Third is hanger alignment. Questions about the gear use and riding style is in there too (as mentioned, good point). Replacing the der and lever are rather far down my list though. Andy.