So it looks like that K2 Mach 4.0 is probably sold since the poster hasn't emailed back. I actually really like my bike, as I call her the Old Turkey Bird. The Trek520 probably doesn't have the geometry that is perfect for me, but I'm young and flexible so I don't notice it too much!
The thing is it is pretty old (93) and I would like to think about replacing the components. It's a trek 520 touring bike and it has a mix of MTN and road parts. What if I replaced it with all road? it looks like a lot of newer touring bikes are doing that. What would the advantages of staying mixed or going road. I think I would like to go higher end parts shimano 105 (or even SRAM if I knew more about them) minimum since this is my one and only bike and I would get a lot out of upgrading it to some nice pieces. But would I really value those changes on an old lunker? Since my parts are so old and technology has come such a long way, I know I will feel a difference with any drivetrain switchout.
So as many of you know the Old Turkey Bird has downtube shifters. Any upgrade must take those out! I was thinking of putting on STIs but the down tube shifters and barcons are supposed to be indestructible. How much trouble have STIs for sure given you guys? I've actually never had any problems with my shifters and I don't want to lose that security. But at least I don't think I would strike my knee on the barcons- that long top tube is good for something!

