I have a triple on my rain bike 50/40/30 with a 12-25 in the back... It gives me super low gearing for the once in a while when I just want to spin up a hill, and at the top end I still get a couple more gear inches than on my other bike with 53/39 - 13-26. While I rarely need to drop to the 30t, there are times when it comes in handy.