[ is it displays? ] -yes-> [ inches ]
↓ no
[ is it screws? ] -yes-> [ inches ]
↓ no
[ is it tires? ] -yes-> [ inches ]
↓ no
[is if flight altitude? ] -yes-> [ feet ]
↓ no
[ metric ]
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).
[ is it displays? ] -yes-> [ inches ] ↓ no [ is it screws? ] -yes-> [ inches ] ↓ no [ is it tires? ] -yes-> [ inches ] ↓ no [is if flight altitude? ] -yes-> [ feet ] ↓ no [ metric ]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).
Also, floppy disks.
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”
Road bike tires? Metric. Mtb tires? Imperial. Car tire inner diameter? Imperial. Car tire width? Metric.
Car tire height? Neither. Fun fact.