Here at Diego Garcia for my TREK 2100 I use a Bontrager crank triple, but since the island has no hills, I have never used the lowest gear chog. Now that I will change my crankset to a Shimano Ultegra 6600, I can get a double for a lower price than the triple model. I know if I go with the double, I need to change out my front derailluer to a double. So do I need the triple for some of the hills in Japan? Is anybody just mainly using a double crankset or should I opt for the variety and go with the triple?