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triple on the double(3 posts)

triple on the doublepkompath
Nov 2, 2001 2:32 PM
What are the pros and cons of using front and rear derailleurs meant for a triple on a double crankset. Any nuances in the installation. The seller says, "Yeah, you can use them on your double setup if you want. The difference between the double and triple is that, for the FD, the chain cage is longer and has more travel (you can adjust the amount of travel). The RD has a longer chain cage too to accommodate bigger gears". I dont disagree with his statement, but there has to be some disadvantages.
Can't think of any except a tiny amount of weightcory
Nov 2, 2001 4:45 PM
A front derailleur's job is really simple, and they all work pretty well. It probably has a little more metal and space in it than it needs to shift over two rings instead of three, but I can't think of anything else...
re: triple on the doublegrzy
Nov 2, 2001 4:57 PM
The design of the plates that make up the cage are different. The triple is more of a compromise and doessn't shift as cleanly as a double, but it works. The triple is also set up such that the middle CR is a 42 not the typical 39 found on most doubles - a small point, but the diameters are different and when you see how shaped the plates on a triple are you'll see what I mean. The rear is a bit heavier (don't forget the extra chain), but otherwise works fine. People will often use a long cage triple on a normal double setup if they're using a really wide range cog set (like from an MTB) for serious hill climbing. If you think you might ahve a need for triple gear and want to avoid additional costs later on then get it.