The best-selling bike spare part? Tubes, of course. A flat happens to the best of us, so you want to be prepared when “it” happens. There have been experiments with solid rubber tires, but they usually ended less than smooth. Fortunately, John Boyd Dunlop came up with the idea of packing air into a tube in 1887 to help vehicles of all kinds run more smoothly. Dunlop was not even a bicycle specialist, but rather a veterinarian, but bicycle lovers all over the world are grateful to him to this day. Here you can find out how to find the right inner tubes for your bike, so you can carry some spares.