Originally Posted by JMessick82
I just wanted point out that if you re-read Network's last sentence, I think he was saying that you DO need to have the same diameter spare as the rest of the wheels, but that the width and sidewall height don't matter as long as the diameter is the same.
That's exactly what I was saying.
Even the "full size" spare you get with the off road package (or towing package - it comes with either) isn't the same width as the actual tires. One the size of off my on/off road tires wouldn't fit in the well.
However, as long as the diameter is the same, it should avoid any leveling or tire stress issues no matter what the size wall or wheel size is. I just wouldn't want to run with it any longer than necessary, considering even an identical tire would have a different amount of tread wear.
That's especially true if you never maintain the spare (proper air pressure and the like), then expect to drive on it after it's been in the trunk for 4 or 5 years. Pickups are even worse since the spare is usually under the bed, exposed to the elements. Just about as bad are the ones mounted outside on the back gate.
Spares are exactly that: spares. If they were replacements, they would call them that.
The key is, you it's not a compact spare. Donuts are for eating with coffee, not for running on trucks.