Kia Optima: Tire ReplacementIf the tire is worn evenly, a tread wear indicator will appear as a solid band 1/2 inch wide (12.7 mm) across the the tread. This shows there is less than 1/16 inch (1.6 mm) of tread left on the tire. Replace the tire when this happens.
Do not wait for the band to appear across the entire tread before replacing the tire.

Tire Rotation
Compact Spare Tire ReplacementLift And Support Points
When heavy rear components such as suspension, fuel tank, spare tire,
tailgate and trunk lid are to be removed, place additional weig ...
Replacement
1.
Disconnect the negative (-) battery
terminal.
2.
Loosen the mounting screw and
then remove the crash pad lower cover (A).
3.
Remove the eva ...
Smart key
With a smart key, you can lock or unlock a door and even start the engine without
inserting the key.
The functions of the buttons on a smart key are similar to the remote keyless
entry. (Refer ...