If you've ever mailed a moped wheel before, you know what a hassle it can be to find a suitable size box to fit it's goofy dimensions. This morning, I picked up a box at the post office which is the absolute perfect size for shipping a 17" or smaller wheel (axle removed of course). Just ask your local postal clerk if they have the box that their flattened priority mail boxes were shipped in to their branch. The best part about these boxes besides them being the perfect size is, they are absolutely free! The PO just throws them into a recycling bin after they take out the contents. The clerk at my post office is even gonna save them for me when they come in.
So get those boxes and start shipping wheels!