Originally Posted by
xroadcharlie
...I would just like to know why since the derailer and shifter are already there.
1) unnecessary weight
2) clumsier shifting
3) slightly more exaggerated chainline issues at the extremes
4) doesn't add much in the way of gear combinations, except perhaps at the lowest end
Do you need more reasons?
BTW, I have a triple on my current touring bike and have had many triples over the years. They're fine, but they do suffer from the above limitations.
If I'm building a general purpose road bike, or a faster road bike, it'll be a modern 11-speed double for sure. 53-39, 52-36, 50-34, 46-36...there are many options to suit just about all tastes.