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My truck came with 4 BFG AT's 2 of them are 31's I know that for sure cause thats what it says. I have a problem with the other too though. They are both have about 15-20% left and they are still taller than the 31's. The tires say they are 10r15lt 1040 m/s and I tried google but didnt come up with anything. So what size are these tires.
 

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03 Silverado in progress
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Call BFG or a local dealer and ask them.....simple as that
 

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10 is the tread width in inches, r means its a radial, 15 is the rim size, lt at the end of the size means means its a light truck numeric wide base tire or also called a flotation tire like Big E said, the height will be standard based on the width, 1040 is the load rating, m/s is the speed rating in mph. this is the way tires used to be measured before they standardized the metric sizes we normally see today. the tires you have are the equivalent of a 31/10.5r15. now however the bfg 31/10.5r15 only actually measures 30.7
 
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