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more doors or wheels?
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How many doors are there in the world?
Without getting too deep into the numbers, we can estimate that there are as many as 33 billion doors in the world, between houses, apartment buildings, vehicles, and the cabinets, closets, and other compartments inside them.
That’s a lot of doors! But how does it compare to the number of wheels? Let’s take a look.
How many wheels are there in the world?
Okay, it’s pretty much impossible to give an exact count of all the wheels that exist in the world. After all, we’re making more all the time, and have been ever since the first wheel was invented around 3,500 BCE.
About 152,971 passenger cars were manufactured in 2020 alone (that’s 17 a second!), and even Hot Wheels produces close to 15 cars every second! And that’s not taking into account all of the wheels turned out each day for bicycles, shopping carts, airplanes, office chairs, and non-Hot Wheels toys.
To get a decent estimate of the number of wheels in the world, let’s break down the different types of wheels.
Cars
The first car, the three-wheel Benz Patent Motor Car, was invented in 1886—and ever since, wheels have been a part of life.
There are 1.446 billion cars in the world today. Multiply that by four, the average number of wheels on a standard modern passenger car, and you’re looking at 5.784 billion wheels.
“But, wait,” you say (in a smug, anti-wheel voice). “Don’t most cars have the same number of doors and wheels?”
And it’s true: most of the cars manufactured in the world are sedans, four-door SUVs, and other cars with an apparent wheel-to-door ratio of 4:4. For instance, the Toyota Corolla, the best-selling car of all time with 37.5 million units sold, has four doors and four wheels—a wash, right?
Wrong. Most cars have the same number of doors and tires—but wheels are a very different matter. After all, every car has a steering wheel. The gears that run your engine? Those are wheels, too. In fact, your car is full of wheels, big and small, that unquestionably outnumber the doors.
Even if we knock off the four main wheels and limit our count to steering wheels and transmissions, that’s an average of six wheels per car. Do the math, and we’re talking 8.676 billion wheels—more wheels than people, let alone doors for them to walk through!
Toy wheels
Toys are another major source of wheels, from Hot Wheels cars to LEGOs to Tonka trucks, Razor scooters, and that Fisher-Price corn popper toy that toddlers push around.
Hot Wheels alone has sold more than six billion cars, meaning there are roughly 24 billion tiny wheels out there in the world—and these miniatures don’t have working doors, meaning that every one of those wheels stays in the county. Hasbro’s Tonka has sold millions of pint-sized construction vehicles, with over 15 million sales of the iconic yellow Mighty Dump Truck alone. Hello, 60 million more wheels.
We could keep going—but adding up the sales of every single toy car company is a task too gargantuan even for us. Suffice it to say that if the gears-and-steering-wheel argument didn’t convince you, the toy industry produces enough wheels every second to outnumber the world’s doors without a sweat.
Bicycles and motorcycles
Sometimes two wheels are all you need—just ask bicycle and motorcycle enthusiasts!
Bicycles have been around since German inventor Karl von Drais patented the first in 1817, and there are about 1 billion bicycles in the world today. Motorcycles, on the other hand, were invented by Gottlieb Daimler in 1885, and there are just 49 million today.
Between bicycles and motorcycles, we add at least 2 billion wheels—and that’s not taking into account gears!
Other wheels: shopping carts, trailers, and furniture
Between cars, toys, and other wheeled vehicles, it’s already clear that wheels outnumber doors. But if you’re still not convinced, take a look around your home and neighborhood.
Got an office chair in your spare room (thank you, work-from-home)? That’s an average of five wheels. Shopping carts, hand trucks, trailers, and baby strollers all have wheels (and no doors). If you’ve got any furniture in your home with casters, those count as wheels too—and, if we’re getting really technical about it, every single sliding drawer in your home requires at least a couple of wheels to operate.
The bottom line
We’re nowhere near an exact estimate of the total number of wheels in the world, but it doesn’t matter. Already, we’ve identified well over a possible 37 billion wheels in the world—way more than the number of doors.
https://getjerry.com/car-insurance/more-wheels-than-doors