8. Check Your Tire
How To: If you haven't done so already, it's time to figure out why you got your flat. It'll be a real waste of time if you go through this whole process and then get another flat as soon as you pump up your new tube. Inspect the inside of the tire for glass or anything sharp that may have poked through the tire. Use a rag to wipe the inside of the tire and search for any tiny pieces of glass or thorns that may be imbedded into the tread.