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The tires on your truck are 31.9" diameter the spare is 32.1 diameter. There there is a difference of 0.5% in which your spare is the larger tire. Not enough to get excited about. The 20" wheels and tires are optional, but only the option only includes the 4 tires on the ground.....at least it's not a donut spare...LOL
 

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I was out cutting the yard and stopped to take a break. So I sat down next to the rear of my FX4 and remembered your post. So under the rear end I went to check my spare tire situation. I also have the same size spare as you hanging under the bed, except my spare is a Wrangler tire. The difference in the diameter between the tow different sizes if it does bother you could be adjusted simple by letting out a few pounds of pressure from the tire.
 
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