A compact spare tire has a shorter tread life than a regular size tire. Replace it when you can see the tread wear indicator bars on the tire. The replacement compact spare tire should be the same size and design tire as the one provided with your new vehicle and should be mounted on the same compact spare tire wheel. The compact spare tire is not designed to be mounted on a regular size wheel, and the compact spare tire wheel is not designed for mounting a regular size tire.
Kia Niro (DE HEV) Owners Manual: Closing the tailgate
Lower and push down the tailgate firmly. Make sure that the tailgate is securely
latched.
WARNING
Make sure your hands, feet and other parts of your body are safely out of
the way before closing the tailgate.
WARNING - Exhaust fumes
The tailgate lid should always be kept completely closed ...
Kia Niro 2017 (DE HEV) Service Manual: Rear Center Seat Belt Retractor Repair procedures
Replacement
When installing the belt, be careful not to damage the retractor.
1.
Remove the rear seat back dust cover.
(Refer to Rear Seat - "Rear Seat Back Cover")
...