If you've ever had to remove a tire from your bicycle, you know how much of a pain it can be. Pedro's Tire Levers make short work of the job.

Insert the chisel end of one lever under the deflated tire bead (~180° from the valve stem) then pry it downward toward the center of the wheel so you can clip the other end of the lever onto the nearest spoke. With that in place, insert the second lever and slide it along the tire bead to eventually work the whole thing off. When you're done, the two levers snap together in a LEGO-like way, so they store together easily.

A simple tool to be sure, but when the time comes, you'll be glad you had it in your kit. Get a pair for $6 on Amazon.