Talk to your local shop. Many compact doubles with have virtually the same gearing as triples. You might lose your lowest gear or two, however. But you'll most likely save some weight and have cleaner shifting. You can put a triple on any bike, however. If it doesn't come with it, you can swap out. It's all in what you prefer. I live in a hilly area and was on a triple for a long time. I switched to a compact double and love it.