Originally Posted by tlippy
Can anyone tell me the exact difference between a 105 double and triple FD.
Specifically the difference between a FD-5501 and FD-5504?
I went down to my shop where I have a pair of Ultegra bikes. One has a double and one has a triple front derailleur. At a glance:
1. The triple cage has a much wider inner blade. I assume that's to lift the chain from the granny to the middle chainring better.
2. The triple cage seems to drop lower in back. I assume that's to prevent rubbing if you are in the granny and one of the smaller rear cogs.