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Old 08-28-2014, 02:37 PM   #1
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Increase tire pressure?

Do you increase your tire pressure when pulling your TT? My standard tire pressure is 35 lbs. in each tire....If I am suppose to increase, how much should I increase it too? Thanks!
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Old 08-28-2014, 02:55 PM   #2
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I don't. I run everything at the pressure specified on the spec sticker.
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Old 08-28-2014, 06:01 PM   #3
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I run mine at the MAX specified when towing. And will lower the pressure when not towing for a little better ride. My TV is also my daily driver a 3500 ram.
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Old 08-28-2014, 07:00 PM   #4
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Rear tires up to 65lbs on my 2500 when towing, back down to 45 when I'm done

It's important to do this as it protects/ offsets the downward force on the sidewalls and potentially prevents blowout

Not sure what kind of weight you are carrying, but my 5er and gear add approx 1400 lbs to the payload
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Old 08-28-2014, 08:10 PM   #5
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Originally Posted by Jmooney View Post
Rear tires up to 65lbs on my 2500 when towing, back down to 45 when I'm done

It's important to do this as it protects/ offsets the downward force on the sidewalls and potentially prevents blowout

Not sure what kind of weight you are carrying, but my 5er and gear add approx 1400 lbs to the payload
Are your recommended tire pressures 45 psi, or does it ride better at that level? Just wondering where you got that number for everyday driving.
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Old 08-28-2014, 08:10 PM   #6
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It's said in some circles that if you up your tire pressure to the max sidewall pressure you get a more stable ride while towing because it makes the tire stiffer and thus less susceptible to sidewall flex. I've been running mine at 44 lbs towing, and it seems to give just a shade more stable ride. But empty it's pretty rough. I assume that since you're spec'd pressure is 35 that you're talking about P-rated tires, and it's the P rating that gives them squishy sidewalls. Also please note that the increased pressure over doorsill spec does not increase the load capacity of the tire.
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Old 09-05-2014, 10:12 PM   #7
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Inflate to the pressure recommended for the load the tire will be carrying. It really is that simple, and there is no hard and fast rule. Each rig will be different.
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Old 09-05-2014, 11:37 PM   #8
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Are your recommended tire pressures 45 psi, or does it ride better at that level? Just wondering where you got that number for everyday driving.
Rear Tire pressure is 45psi when not towing..
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Old 09-06-2014, 07:28 AM   #9
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Are your recommended tire pressures 45 psi, or does it ride better at that level? Just wondering where you got that number for everyday driving.
OEM says 70/40. ( ft/ back) for my Ram 2500 for unloaded.

I have gone up 2 sizes in tires, and experimenting with pressure , ft end forward pitch, and the addition of rear airbags, I find that 70/45 works well for everyday use.

70/65 when towing, with air bags at 45lbs.
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Old 09-06-2014, 09:11 AM   #10
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The specified tire pressure for my half ton truck is 35 psi, front and rear. When driving the truck unloaded (which is nearly always), I run 35 in the front and 28-30 in the rear.

Any time I hook this truck up to a trailer, I increase the rear to 65 and the front to 55.


My dually is used exclusively for towing. I keep the rear at 75 and the front at 65.
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Old 09-06-2014, 09:18 AM   #11
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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, 08:10 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, 08:20 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, 09:14 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, 10:17 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, 09:50 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, 10:13 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, 10:20 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, 10:40 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, 10:50 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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