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Is it bad form to inflate tires up to pressure when it's this cold out?
Yes, you're meant to fill them up at room temp.
Getting the car up into our 1st floor flat is a bit tricky to make sure it's at room temperature.
Or, just apply a bit of SCIENCE.
https://www.continental-tires.com/car/tire-knowledge/winter-world/tire-pressure-in-winter
According to that: 10 degrees C is worth 1-2 PSI (0.07 to 0.14 bar).
So if it's ~5 deg C outside then just inflate them to ~3 PSI lower than recommended.
Is it bad form to inflate tires up to pressure when it's this cold out?
My rudimentary understanding of physics makes me think that when the weather warms up they will explode. Possibly with fire.