More @#$%-ups today. I go to get the bike out and the rear is flat. There's a gash in the tube on the inner side... I don't know what to blame, the rim tape is intact and smooth. But I know it's not helping that the tubes are small and the tire is medium. Swapped it. Took kiddo to daycare. He had to stop 2 miles into the ride for a pee in the bushes, because he is three. Soon as he's done with that, I turn around and my back tire is flat. Patched it while kiddo played with sticks. Got the tire pumped up just enough to ride and get frustrated with pumping. Got him delivered and detoured to Walmart. I have this dinky CO2 inflator that's been knocking around my bag for years and never used. I figure today's the day. Walked past the bike section to the pellet rifle section and bought a round of 12-gram CO2 cartridges... they are way cheaper than the bike section, less than half the price per gram. Feeling pretty clever, I take them out to my bike and no dice - my little inflator takes threaded cartridges. I go back in and can't find threaded cartridges in either section. I go back to the bike section feeling foolish and buy a new inflator, plus a 2-pack of 16-gram cartridges that fit it, for $22. I still don't have the right tubes - need medium-stem, medium-size which is fairly oddball. Will check my supplies at home and see how many I might have in a box and order some more if I need to.