Actual side-of-the-road emergency repairs, not counting stuff I've done sitting in front of a bike shop or while stopped for the night--not much other than flats. Everything else has been preventive. I'll replace the BB, chain and cassette before a long ride, and repack wheel, headset and pedal bearings. Most nights on tour I check out the bike and make adjustments, oil things, clean up, check stuff out. I broke a spoke once a mile from town. Rather than use my on-board spare and tools on the side of the road, I wobbled to the bike shop and did it there. I think I've been lucky, but I also like to think getting the bike ready beforehand, and nightly checks, help out a lot. I like to carry spares and tools, just in case, for sure.