What do your tires really measure?
 

I am looking into new tires, so I am comparing what I have with others in respect to height.

I have 265x75R 16's AT's they only measure 30.5" from the ground to the top of the tread (with a ruler across the top of the tread) at 36 psi.

I thought they were closer to 32"???

So if you are curious, park on flat ground, put a ruler across the top of your tire and measure their height. Please post your results.

275/70/16 Michelin M/S 30.75"

You could try making two measurements. One top to bottom, and one side to side, then avaraging them. That might give you a number closer to 32 and compensate for squishing under weight. Or it might not, I just thought of it.

Measure your spare while laying flat (paralell to the ground).
BFG says they are 31.8, while the 275-70R-16 is 31.3" tall, but wider. The width measurment is said to depend on the width of the rim the rubber is installed on.
CLICK HERE to see their chart.

My 31x10.5's only measured just a little over 29 inches when I took a measuring tape to them a while back. They were a little low at the time, so when they are properly inflated I'd guess they are actually just a little under 30 inches.

-Keith