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Old 09-06-2014, 10:18 AM   #11
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Originally Posted by etex211 View Post
Any time I hook this truck up to a trailer, I increase the rear to 65 and the front to 55.

Wow! Are those P-metric tires on that 1/2 ton? I was under the impression those maxed out at 44 lbs generally.
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Old 09-09-2014, 09:10 AM   #12
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Wow! Are those P-metric tires on that 1/2 ton? I was under the impression those maxed out at 44 lbs generally.
Not these days. Mine max at 51 psi. Though 60 seems higher than the P rated tires I've seen.

Back in the days before they were making a somewhat tougher P rated tire I'd swap out the P rated tires on Suburbans (owned 3 over the years) for LTs in a heartbeat. But now that they actually make "truck" P rated tires that can be aired up more, I've been towing with 45 psi in the rear and 40 psi in front. It makes a huge difference. I really have no need to go to LTs on my Sierra.
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Old 09-09-2014, 09:20 AM   #13
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Not these days. Mine max at 51 psi. Though 60 seems higher than the P rated tires I've seen.

Back in the days before they were making a somewhat tougher P rated tire I'd swap out the P rated tires on Suburbans (owned 3 over the years) for LTs in a heartbeat. But now that they actually make "truck" P rated tires that can be aired up more, I've been towing with 45 psi in the rear and 40 psi in front. It makes a huge difference. I really have no need to go to LTs on my Sierra.
That's awesome! What tires are you talking about? I might need some for my truck. I've been hunting for LT's, but there aren't many options in 20" wheel size. I'd like to have a little more stiffness and capacity out of my tires, and if I could avoid going with LTs, that would be great. But every P-metric tire I've ever owned maxed out at 44, not to mention the penalty for mounting P-metrics on a truck. And that includes the tires on my '12 GMC (current TV), so they're not that old.
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Old 09-09-2014, 10:14 AM   #14
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The load range max is based upon max inflation pressure of the tire. It derates from there as the pressure is less than max.
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Old 09-09-2014, 11:17 AM   #15
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The load range max is based upon max inflation pressure of the tire. It derates from there as the pressure is less than max.
Actually, that's not true according to my research. The weight rating of the tire is determined at "suggested" inflation pressures. Increasing to max pressure (like say 35 lbs to 44 lbs on a P Metric tire) increases the stability of the tire, but it's weight rating is still determined at 35 lbs, thus running the tire at higher pressure does not get you more weight carrying capacity.
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Old 09-12-2014, 10:50 AM   #16
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Actually, that's not true according to my research. The weight rating of the tire is determined at "suggested" inflation pressures. Increasing to max pressure (like say 35 lbs to 44 lbs on a P Metric tire) increases the stability of the tire, but it's weight rating is still determined at 35 lbs, thus running the tire at higher pressure does not get you more weight carrying capacity.
Incorrect. All the major tire manufacturers maintain load versus inflation pressure takes. The weight the tire can safely bear at 35psi is not the same as at max pressure.
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Old 09-12-2014, 11:13 AM   #17
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Incorrect. All the major tire manufacturers maintain load versus inflation pressure takes. The weight the tire can safely bear at 35psi is not the same as at max pressure.
It looks like you're absolutely right. But then I'm having some trouble locating the tables for my tires... will just have to look harder when I have time.

I do seem to recall seeing the warning repeatedly that states "inflation beyond recommended pressure does not increase the load capacity of the tire" I will have to look to see where I have seen that warning...
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Old 09-12-2014, 11:20 AM   #18
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http://www.tirerack.com/tires/tirete...jsp?techid=195

According to this page, Standard Load P-Metric tires are designed to carry their maximum load at 35 PSI. Now my tire has "max pressure 44 PSI" stamped on the side, but the door pillar says 30 PSI. The way I read this is that my Standard Load P-Metric tires on my light duty truck will carry their maximum rated load at 35 PSI. There is no provision for extra load with extra PSI. That's NOT the case with XL (Extra Load) tires or LT (Light Truck) tires. With XL and LT tires, there is additional load carrying capacity at higher inflation pressures up to the max.
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Old 09-12-2014, 11:40 AM   #19
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What increasing the psi does is stiffen the sidewall to help prevent a "wallowing" feel while towing.
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Old 09-12-2014, 11:50 AM   #20
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What increasing the psi does is stiffen the sidewall to help prevent a "wallowing" feel while towing.
Right, but not the load capacity. At least for a standard P-Metric tire.

I'm still curious about those tires you mentioned earlier. Were those XL tires by chance? There are more of those available than LT tires in 20" diameter...
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