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 | RRagent
Join Date: Oct 2005 Posts: 56 North carolina 
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2006-05-20 129613
Lets open another one up;
My 2006 GMC 1500 ext cab requires 35lbs tire pressure,
Tire has max pressure on sidewall of 44lbs.
I realize if I keep tires at 35 lb truck will ride better,
but tires are not gonna last. I had 2004 reg cab 1500 kept
tires at 45 front and 40 rear when I traded it had 39,000 and about 3/4 worn out.This is running in mountains and foothill of North Carolina.
Any suggestions?
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 | kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon 
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2006-05-20 129619
It depends on the vehicle but I'm a big proponent of keeping tires inflated to the max pressure. What I do is fill them to the max sidewall pressure and drive around awhile. If it's bouncing around too much adjust downward as needed. When working with a new vehicle every 4-6 weeks I'll measure the tread depth at the center and edges to get a feel for the wear. If the center seems to be wearing too fast adjust downward. Eventually a sweet spot can be found. I don't usually care about ride. ....
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 | earthwrks
Join Date: Dec 2003 Posts: 3853 Home Office in Flat Rock, Michigan
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2006-05-20 129628
I had 10 years in as an automotive service engineer with the Big-3 and the imports. There's a lot more to the placarded air pressure. The public (and even some experienced tire guys) don't realize that the tire pressure advertised is for a specific tire the manufacturer has tested and, or nowadays---designed for that particular vehicle. Installing different tires or changing the load distribution calls for different psi than recommended. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2006-05-23 129718
I'm driving a 1/2 ton with 3/4 ton tires on it. The side or max inflation on the side wall is 80lbs but they currently are at 50lbs and are working well. The ride is still rougher then the original tires and they have little or no squat to them even with the rear well loaded and sagging. Now on the trailer that I most often pull they have 45 on on the side and I found them to be the best at 60lbs otherwise when fully loaded try and keep it on the road at 65. I also have raised the hitch point to the truck to improve the tow. It is all different for every application. My boat trailer is built for a heavier boat and on thse I run them about 15lbs below the max on the sidewall and it tows great at any speed that I've towed it. ....
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