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crwdns2944351:0crwdnd2944351:0How to Replace a Front Derailleurcrwdnd2944351:0crwdne2944351:0

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Introduction
The front derailleur is the mechanism that shifts the chain on bike with more than one front chain-ring. It only has to move the chain side to side between the front chain rings, but it has to do this with the top, taut portion of the chain. There are many different makes and models, but they all share the same basic design and functionality. Front derailleurs are attached to the bike with either a clamp or bracket. You need the correct "clamp size" (the clamp is the ring that anchors the derailleur to the bottom of your seat tube). Clamps come in 1-1/8", 1-1/4", and 1-3/8". Most bikes will use the 1-1/4" size.