Typically larger tires handle your vehicles weight differently than stock tires and the original door tag pressure recommendations don't apply. A tire not properly inflated will wear incorrectly and more quickly than a properly inflated one would.
An under-inflated tire will cause increased rolling resistance which will rob you of fuel economy and possibly damage the tire due to excessive heat. Other symptoms of under-inflation can be a steering pull.
On the other hand an over-inflated tire can give you an improvement in fuel economy but that savings will disappear when you need to replace your tires sooner. Over-inflation will also cause a harsher ride and potentially poor handling since the tires may skid over the road instead of grip.
Checking proper tire inflation is rather simple and requires some chalk or a utility crayon.
Make a mark all the way across each tire from sidewall to sidewall.
Drive the Jeep for a short distance, a straight line is best.
Note the wear pattern in the chalk. If there is chalk left at the edges, the tire is over inflated. Chalk left in the center means it's under-inflated. A clean pattern indicates the pressure is just right for your tire/rim/vehicle combination.
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Last edited by CJ7-Tim; 06-20-2010 at 06:04 PM..