Remember when we told you in a previous article that the toy company LEGO manufactures most of the world's tires? According to Guinness World Records, LEGO made 381 million tires in 2010 alone.
While Guinness tracked this figure for the purpose of awarding the world record to the largest manufacturer of toy wheels, LEGO does actually make more tires and wheels than companies that manufacture wheels for cars, trucks and bicycles.
But so many other things outside of the toy industry use wheels, too. And that got us wondering just how many wheels are in the world? Well, get ready for the wheels inside your head to start spinning as we try to break down the answer.