Joined: Jun 2013
Posts: 4,094
Likes: 2
From: Bozeman
Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2
Some bikes need top pull derailleurs. Some need bottom pull derailleurs. Depends on your bike and where the braze on cable stops are. (Many new derailleurs come with "dual pull" capabilities which work with either top or bottom pull bikes.) Triple and double cranksets have different styles of derailleurs. You also have to be weary that derailleurs come in all sorts of different sizes for different sized seat tubes.