To k9power that wanted a list for 500 miles - that was what I listed above in post number 6.

I worked in a bike shop and built up my touring bikes from frame and fork. Maybe that is why my list is a bit more extensive than some others, I keep my bikes tuned and running smooth, thus I frequently use these tools. For example, that is also why there is a second minimalist multi-tool handy in the handlebar bag whereas the other tools are in the bottom of a pannier, I want the small one handy so I can easily get to it if I notice a loose bolt or want to make a minor adjustment.

I left a lot of stuff off of my list that others included, such as brake pads because if my pads are so worn that they might not last 500 miles, I replace them right away. But, spare cables are on the list because I really do not want to go up and down hills if my rear derailleur is stuck in one gear. In 500 miles, I won't bother cleaning the chain, thus no cleaner. One thing that I should have mentioned in post 6 above, if you do not regularly check your cleat bolts for tightness, bring a spare cleat bolt.

Think about how bad a day you will have if you have to walk 20 miles, then think about what might happen to cause that, then think about what to bring to fix it.