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) Owners Manual: Tire Rotation
To equalize tread wear, HYUNDAI recommends that the tires be rotated every 7,500
miles (12,000 km) or sooner if irregular wear develops.
During rotation, check the tires for correct balance.
When rotating tires, check for uneven wear and damage. Abnormal wear is usually
caused by incorrect tir ...
Hyundai Elantra AD (2016-2020) Service Manual: Side Airbag (SAB) Module Components and Components Location
Components
1. Side Air Bag (SAB)
...