Ok so here is the deal. I am planning a cross continental through Europe and Asia this coming spring and I need some help on deciding what components to to upgrade on my LHT. Most of all the common sense stuff has already been taken care of or changed to personal preference. Seat, chain, breaks, bars, shifters, tires (all upgraded), it's not the bike I originally purchased. Except for the rims, spokes and hubs. They are the standard issue, Rims Alex Adventurer, 36h. Black w/ eyelets, Hubs Shimano XT, HU-M770. 36h. Silver, Spokes DT Swiss, 14g stainless. Silver.
This isn't the first tour this bicycle will have been on but it will be the most grueling, demanding, and completely self supported. So, what in your experience is more likely to fail on a long tour and what's the biggest bang for my buck? Considering parts replacement in Kyrgyzstan is going to cost me a fortune? Or are the standard parts up for the challenge?