The bike I'm taking on my tour starting May 1 was doing ok - relatively comfy for up to 60 miles.. But my hands were getting pretty numb and tingly by the end of those rides, so i swapped the moustache bars for a pair of drop bars. But these drop bars aren't really working out. Now I'm trying to decide whether to get a new pair of drops and try to work out the fit on them so that the bike is just perfect, or to just go back to the moustache bars and say that it's good enough, and stop messing with it.

I'd also decided against getting a brooks b17, but recent lower back pain has been making me rethink that decision, but if I've only got 6 weeks to break it in I don't know if it'll happen in time.

And lastly, I still haven't decided whether or not to switch my rear cassette (currently a 7-speed 11-28) for something that goes up to 34, or to switch my front cranks out from a 52-42-30 to something more like a 48-36-24.

If you have any ideas about any of these specific issues I'd love to hear them, but more generally, I'm wondering at what point before a tour you just leave the bike alone as "good enough" even if there are a couple bugs, for the sake of making sure you don't mess up something worse before the tour starts? How long do you train for with the exact configuration you're going to use?