tire

"We had to repaint our house, and to do that we had to remove the stairs in the backyard. My dad whipped this up so we could still use the door."

"Where did I put the science?" "Glove compartment." "Thanks, brah."

But is it airtight?

No, wheely.

I certainly wouldn't want to trail this guy for too far.

If your neighborhood BMX hills have a bit of a landmine problem, then go ahead and take this bike.

From the submitter:

In the down & out, post apocalyptic city of East St. Louis Illinois, anything metallic that is not welded in place is fair game for scrappers, including man-hole covers. The city, being without the financial means to replace the missing covers, inserts used tires in their place to alert drivers of the open holes littering the streets.

Factory-installed braces to secure them? Not so much.