Crankset question

[Catrin]

I will likely go with triples, and while unorthodox, my fitter and I are discussing the merits of a full mountain bike drive-train - at his suggestion. I will have flat-bars and trigger shifters. Road bars are not an option, period (physical issues). Of course with this approach I do run the risk of running out of gears at the fast end of things - but quite frankly - if I have to compromise on hill climbing options or speed I will keep my climbing options.

Have I made up my mind? Nope, but I already know that my gearing will wind up on the touring/mountain bike end of things - I just need the right combination that will give me the options my legs need...As I said earlier however, I am not making such decisions right now - just seeking a better understanding of how things work together so I can make an intelligent decision and be able to properly consider the advice I am given.

Ed: I am going to consider all of my options however - and I like the idea of test-riding a double compact to see how differently it might shift if I can find one small enough. If nothing else the LBS could pop it on one of their trainers for me to try...