Many SUVs or off-road vehicles include a spare tire mount on the back of the vehicle. This allows easy access to your spare when needed. Sunlight and UV rays can cause a tire that's not often in use to crack and the rubber to weaken. Driving allows the tires on the vehicle to heat up and stretch. The tire cover shields the spare tire from damaging UV rays to prevent dry rot and damage. A spare tire cover also adds to the look of your vehicle, and many colors are available to match your vehicle's trim. Adding a tire cover allows you to keep your spare tire in good shape for when it's most needed. If you need a spare tire cover, check out the options at O'Reilly Auto Parts.