Thanks for the feedback, ladies! I'm glad to hear that, for the most part, the difference between 170 & 172.5 would be minimal. I'm not at all concerned about going from a triple to a double...as my Cervelo (that I'm selling) is a compact double, so I know what to expect. As I stated in my original post...I would only consider doing this swap, if I could do it for under $100. I don't want to sink a ton of money into a "temporary" bike. Especially since I'm actively looking for a new bike, so I'd rather put my hard-earned dollars towards that.