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On the other hand - when driving on really hot days (really hot road  
surface), our tire guys told us to under-inflate the tires to keep  
them from expanding so much that they burst. (which had happened to us  
a few times).

Steph

On Oct 8, 2009, at 9:52 AM, Sisu West Ranch wrote:

> "...put nitrogen in your tires to decrease the tire temperature as  
> you drive..."
>
> Since air is mostly nitrogen, it ain't gonna happen.  The supposed  
> reason to inflate with nitrogen is to protect the rubber on the  
> inside from oxygen and ozone.  With modern  rubber it is most likely  
> not necessary.
>
> Keeping the tire pressure from going any lower than optimum will do  
> more to limit the temp.  The reason is that air is pretty close to a  
> perfect gas.  A perfect gas does not heat from being compressed,  
> then expanded as the tire goes over bumps.  The rubber is not  
> perfectly elastic, therefore; the flexing causes it to heat.  You  
> can test this by stretching a rubber band over your lips.  If the  
> tire pressure is lower, you get more flex and then more heat.  In  
> fact, over inflation will keep a tire running cooler, and thus less  
> likely to blow.  The cost is a harsher ride and a greater  
> susceptibility to cuts from road hazards.
>
> Ed
> Ed & Wendy Hauser
> 2994 Mittower Road
> Victor, MT 59875
>
> (406) 381-5527
>
> ranch(at)sisuwest(dot)us
>
>
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