There are hinges that use wheels, though, but I would agree that a standard door hinge is not a wheel.

But is a motor a wheel? Maybe not a servo motor since it can’t completely rotate but a stepper or most other motors can freely rotate as much as they wish.

Pulleys are considered wheels - your vehicle is loaded with those.

Ball bearings… Just counting those alone would put wheels above doors in my house.

Lotta cabinet hinges use wheels.

And electric eels.

No, sorry, I think I got myself confused.

Wheels are round. Planets are round. Therefore, all planets are wheels. And we do not have the parking space for that.

Do we only count wheels on vehicles? Or do toys count? What about my toddler’s cozy coupe? Wikipedia says that pulleys are a type of wheel, too.

I’m not gonna do any real math or anything but I would guess that just the vehicles and toys would push wheels far above doors.

But if we include wheel-like, we have to include door-like, such as flaps. Would we include, say, drain plugs? Taps? Gates - both fences and electrical? Drawers?