For proper maintenance, safety, and maximum fuel economy, you must always maintain recommended tire inflation pressures and stay within the load limits and weight distribution recommended for your vehicle.

All specifications (sizes and pressures) can be found on a label attached to the driver's side center pillar.
Tires and Wheels
Recommended Cold Tire Inflation PressuresHyundai Elantra AD (2016-2020) Service Manual: Cylinder Block Repair procedures
Disassembly
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Use fender covers to avoid damaging painted surfaces.
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To avoid damaging the cylinder head, wait until the engine
coolant temperature drops below normal temperature (20°C [68°F]) before
removing it.
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When handling a metal gasket, ...
Hyundai Elantra AD (2016-2020) Owners Manual: Notes on the safe use of the Tire Mobility Kit
Park your car at the side of the road so that you can work with the Tire
Mobility Kit away from moving traffic.
To be sure your vehicle will not move, even when you’re on fairly level
ground, always set your parking brake.
Only use the Tire Mobility Kit for sealing/inflation passenger ...