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Front derailluer Question

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Joshman_75 Offline
New Member


Posts: 2
Joined: Apr 2014
Post: #1
Front derailluer Question
Ok, I'm a little confused and need some clarity please. I have a TREK road bike that I use for Triathlons. My front derailleur broke and will not shift. I want to replace it, but all I can not seem to find one for a 21 speed. Why? What am I missing? Am I looking for the wrong thing? What should I look for? Are all front derailleurs the same? universal? Help Please. Thanks
Apr 5, 2014 07:19 PM
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cny-man Offline
Senior Member

Syracuse, NY
Posts: 498
Joined: Jul 2012
Post: #2
RE: Front derailluer Question
Derailleurs are designed for the number of chainrings, not total speeds. You need a triple front derailleur. Google "install front derailleur" to learn what you need to know. sheldonbrown.com and parktool.com offer the best advice.
Apr 6, 2014 04:38 AM
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Joe_W Offline
Veteran Member


Posts: 1,177
Joined: Jul 2009
Post: #3
RE: Front derailluer Question
It also should say "7 speed" (though 8spd will be fine, too). At some point in time people stopped talking about the total # of speeds and started to talk about the cassette (rear) only... Check that the dérailleur is specced for the size of the small and large chain ring (# of teeth)
Apr 7, 2014 02:13 AM
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Joshman_75 Offline
New Member


Posts: 2
Joined: Apr 2014
Post: #4
RE: Front derailluer Question
Thanks guys, I appreciate it. You were a lot of help and I am now more educated today than I was yesterday. Off to shop for a new derailleur. Thanks again.
Apr 8, 2014 03:03 PM
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