Tire Question

I drove into downtown Nashville today and for kicks had the EEZ tire system ON. The outside temp was 88. My truck tires which are 18" and Michelins, were at 101-103 degrees. I have noticed and was surprised that when I have the Pod on, the 14" tires on the Pod are somewhat hotter. That makes sense to me. Speed definitely plays a part as does road surface.

I took a shot at googling it, and it said that tires will run about 50 degrees hotter than the outside temperature. They did add driving 60 mph for  one half hour. I dont know if longer times at same speed would change it. If thats the case my tire temp was really good. I believe it was atleast 80 degrees so my hubs being 97 sound like they are good. I will have to start taking outside temp into account from now on, and see if i can come up with a "normal" range above ambient. Informed people make informed decisions. 

What's the ambient temp? If outside temp is 95, 97 is not very hot.

I always check my hubs with a laser thermometer whenever I stop. I want to make sure my bearing are staying cool. I assume this is an accurate way to check, because the hubs would heat up if the bearings did. Of course if I just came down a long hill, I would get a warmer reading do to excessive braking. I also have just begun checking the tire temp as well. I checked them the other day after an hour and a half of driving 65 mph, and the hubs were 97 degrees and the tires were 120 degrees. I think these numbers sound ok, but does anyone know what good numbers would be, or more important, what are bad numbers. I'm driving from New Hampshire to Pennsylvania (about 5 - 6 hours) on friday. Thanks