Full Size Spare – If Equipped
The full size spare is for temporary emergency use only.
This tire may look like the original equipped tire on the front or rear axle of your vehicle, but it is not. This spare tire may have limited tread life. When the tread is worn to the tread wear indicators, the temporary use full size spare tire needs to be replaced. Since it is not the same as your original equipment tire, replace (or repair) the original equipment tire and reinstall on the vehicle at the first opportunity.
See also:
To Resume Speed
To resume a previously set speed, push the RES (+)
button and release. Resume can be used at any speed
above 20 mph (32 km/h). ...
Off-Road Capability
Jeep is one of a few car brands with an identity strongly associated with
off-road capability, and even though the new Grand Cherokee significantly
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Tire Size
The tire size on the label represents the actual tire size on your vehicle. Replacement
tires must be equal to the load capacity of this tire size. ...