this post was submitted on 09 Sep 2026
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European variant:
Well, screws are more complicated. We mostly use M sizes which are metric. But when it comes to plumbing and compressed air thread sizes you get into imperial terretory fast.
Tires are in inches, screws really aren't. Who wants 3/8 key?
Bicycle tires are both; 28inch 37x622 for example.
No? We use metric for all of these?
You use metric for displays?
I'm in France, and my TV is 55' and my monitor is 27'. I wouldn't be able to tell you the equivalent is centimeters off the top of my head.
Never seen screws in inches in europe (though I'm sure they exist, just don't see them being common), but you're missing wheels, pipes, hoses and fittings, socket wrench drivers, screwdriver bits, clothes (sometimes) and perhaps more
I always buy screws in millimeters in europe. Pipes are occasionally in inches, depending what kind of pipe.
FTFY
both for car and light truck tires. inches for wheel diameter, millimeters for tread width,
Even in the US we use metric tire sizing apart from a select few offload tires, which is annoying because its not even actual dimensions but more of a ratio or percentage of the overall width of the tire (in addition to the wheel size being in inches as you mentioned).
Road bike tires? Metric. Mtb tires? Imperial. Car tire inner diameter? Imperial. Car tire width? Metric.
Car tire height? Neither. Fun fact.
I agree on the tires, but at least in Germany, we measure flight altitude in meters.
And if you don't know for sure you can always default to a "Saarlands"
Also, floppy disks.