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2017 GMC 2500 Denali Standard susp. vs Off Road


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No. A load pressure chart will show the correct tire pressure that should be used based on the actual load on the tires (per axle). Their would be no "optimum" pressure you would run all the time, unless you wanted to run the bone jarring OEM pressures. Most of the time, my pickup is not loaded. I run the pressure according to the chart for the axle load when unloaded, then if I load up, I run the pressure recommended for that axle weight.

 

Sure, this takes a little time and can be a hassle to some degree, but the ride comfort is well worth it. And having tires over inflated for the load on them can be just as bad as having them under inflated for the load on them. Running the stock OEM recommended pressures is having them overinflated for times you are not hauling or towing anything since those OEM pressures are based on having the maximum gross weight on the axles.

 

And the OEM pressures are only good for the stock brand, type, and size tires that came with the pickup. You change to another tire and those OEM pressures may not be correct for that new tire. That is why one should get the load pressure chart for that particular tire.

 

This is what the chart looks like from BFG for my particular tires.

 

BFG KO2 18.pdf

BFG KO2 18.pdf

BFG KO2 18.pdf

BFG KO2 18.pdf

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No. A load pressure chart will show the correct tire pressure that should be used based on the actual load on the tires (per axle). Their would be no "optimum" pressure you would run all the time, unless you wanted to run the bone jarring OEM pressures. Most of the time, my pickup is not loaded. I run the pressure according to the chart for the axle load when unloaded, then if I load up, I run the pressure recommended for that axle weight.

 

Sure, this takes a little time and can be a hassle to some degree, but the ride comfort is well worth it. And having tires over inflated for the load on them can be just as bad as having them under inflated for the load on them. Running the stock OEM recommended pressures is having them overinflated for times you are not hauling or towing anything since those OEM pressures are based on having the maximum gross weight on the axles.

 

And the OEM pressures are only good for the stock brand, type, and size tires that came with the pickup. You change to another tire and those OEM pressures may not be correct for that new tire. That is why one should get the load pressure chart for that particular tire.

 

This is what the chart looks like from BFG for my particular tires.

 

attachicon.gifBFG KO2 18.pdf

 

Ok, with you so far. This is really informative. Now lets assume Im a fifth grader(sometimes act like one). In your example the optimum tire pressure(50psi) for either axle is 2(tires) x 2680 = axle weight. How do you determine correct axle weight of your truck? If empty do you take curb weight plus fuel & passengers and divide by 2 or is there a better way?

It occurred to be I could actually corner weight the truck with my racing scales, but they are only rated for 1500# per scale :( That would have been cool

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Just fill the gas tank, have in the back what you would normally have on a average day, grab another person to ride with you, and head to the nearest scale and get the axle weights.

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Just fill the gas tank, have in the back what you would normally have on a average day, grab another person to ride with you, and head to the nearest scale and get the axle weights.

 

Found out the local dump/recycling has scales open to public. Filled up the diesel, put my dog in back and headed down there. 2017 GMC 2500 4x4 Denali: Front axle 4840/2 = 2420/tire, Rear Axle 3180/2 = 1590/tire for a total of 8020lbs. I received an email from Goodyear this morning with the load and inflation chart. For the front 2500 corresponds to 55psi. For the rear, the lowest was 1825 @ 35psi, then 2000 @40psi, 2175 @45psi and 2335 @50psi.

TIRE LOAD LIMITS (lbs.) AT VARIOUS COLD INFLATION PRESSURES (psi)

 

So my question is this. Are these the lowest psi that should be in the tire for the load OR is this the optimal psi?

If this is the lowest, what percentage above that is customary?

​I don't think I would run my rears at or below 35psi, that seems very low but maybe Im wrong.

I will try and upload the chart if I can figure out how :)

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That is the lowest you should go for your daily running around. When you load up, do it again. Then you will have your markers on what pressures to run your tires for most of your stuff. For most light loads, I don't mess with my unloaded tire pressures. Not going that far, usually under 30 miles. I only concern myself with airing up the tires when I will be putting a serious load on. Me, personally, I would not run the tires in the back below 45 psi. That's me and my comfort zone. As you can tell from what you did, keeping 50-55 up front makes sense, as that is the heaviest part of the pickup when you are empty. I like running 50-55 up front myself. And that would suffice for most things. Then you can primarily concern yourself with the back pressures when you load up. I would only worry about the fronts if you had a snow plow on or you have the pickup at full gross.

 

As a side note, if you know you will loading up the back, air them up to OEM recommended, then put the load on, then go weigh it. You do not want to run around with 45 psi in the back and 2000 lb on the back of the pickup. You can always let some air out if you find you are not heavy enough to justify the higher psi.

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Went down to the dealer today and they quickly adjusted the TPMS system down to 45 all around, so nice not having the warning lights. I briefly explained it to the service manager and he knew exactly what I was talking about. Fronts are at 53psi and I set rears to 48 for now and will play with those a little to see if it makes a difference.

Thank you Cliff for all your insight and knowledge, I really appreciate it!

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Here is the chart for Goodyear Wrangler SR-A


(This did not copy/paste well: load table follows psi listed just below)



2013 - The Tire and rim associaTion, inc. - 2013 2-09






LIGHT TRUCK METRIC TIRES FOR TRUCKS, BUSSES, TRAILERS CUSTOMARY UNITS AND MULTIPURPOSE PASSENGER VEHICLES USED IN NORMAL HIGHWAY SERVICE


TABLE LTM-4A (continued) RADIAL PLY TIRES MOUNTED ON 5° DROP CENTER RIMS TIRE AND RIM ASSOCIATION STANDARD






TIRE SIZE DESIGNATION






USAGE






TIRE LOAD LIMITS (lbs.) AT VARIOUS COLD INFLATION PRESSURES (psi)






35






40






45






50






55






60






65






70






75






80






55 SERIES






LT315/55R16






SINGLE






1875






2020






2195






2405 (D) 111







LT345/55R16






SINGLE






2150






2325






2525






2755 (D) 116







LT375/55R16






DUAL SINGLE






2270 2470






2395 2630






2600 2855






2835 3085






2990 3285






3175 3490






3415 (E) 123 3750 (E) 126







LT345/55R17






SINGLE






2270






2410






2620






2835 (D) 117







LT275/55R20






DUAL SINGLE






1595 1750






1745 1920






1895 2085






2040 2270






2185 2400






2320 2550






2470 (D) 112 2680 (D) 115







LT285/55R20






DUAL SINGLE






1685 1850






1845 2030






2005 2205






2205 2405






2305 2535






2450 2695






2600 (D) 114 2835 (D) 117






2735 3005






2865 3150






3000 (E) 119 3305 (E) 122






LT295/55R20






DUAL SINGLE






1760 1935






1930 2120






2100 2305






2335 2535






2415 2655






2565 2820






2755 3000






2855 3140






3000 3295






3085 (E) 120 3415 (E) 123






LT305/55R20






DUAL SINGLE






1930 2095






2035 2235






2205 2425






2470 2680






2545 2795






2705 2970






2910 (E) 118 3195 (E) 121







LT335/55R20






SINGLE






2405






2550






2765






3000 (D) 119






3185






3385






3640 (E) 125







LT285/55R22






DUAL SINGLE






1795 1975






1975 2170






2145 2355






2335 2535






2465 2710






2620 2880






2835 3085






2920 3210






3065 3370






3195 (E) 121 3525 (E) 124






LT325/55R22






DUAL SINGLE






2270 2470






2375 2610






2580 2835






2835 (D) 117 3085 (D) 120







LT335/55R22






SINGLE






2535






2715






2950






3195 (D) 121







60 SERIES






LT325/60R15






SINGLE






2095 © 106







LT285/60R16






SINGLE






1750






1920






2085






2270 © 109







LT235/60R17






DUAL SINGLE






1250 1375






1375 1510






1490 1640






1610 1765






1720 1890






1825 2005






1930 2150






2035 2235






2135 2345






2270 (E) 109 2470 (E) 112






LT285/60R17






SINGLE






1820






1995






2170






2335 © 110







LT205/60R18






DUAL SINGLE






1080 1185






1185 1300






1285 1410






1390 1520






1480 1625






1570 1725






1655 (D) 98 1820 (D) 101







LT285/60R18






DUAL SINGLE






1715 1885






1885 2070






2050 2250






2270 2470






2350 2585






2505 2750






2680 2910






2785 3060






2925 3215






3000 (E) 119 3305 (E) 122






LT305/60R18






DUAL SINGLE






1930 2150






2080 2285






2255 2480






2470 2680






2600 2855






2760 3035






2910 (E) 118 3195 (E) 121







LT325/60R18






DUAL SINGLE






2150 2335






2285 2510






2480 2725






2755 3000






2855 3135






3035 3335






3195 (E) 121 3525 (E) 124







LT345/60R18






SINGLE






2535






2745






2980






3195 (D) 121







LT375/60R18






DUAL SINGLE






2680 2910






2830 3110






3070 3375






3305 (D) 122 3640 (D) 125







LT265/60R20






DUAL SINGLE






1660 1825






1820 2000






1980 2175






2150 2335






2275 2500






2420 2660






2600 2835






2695 2960






2830 3110






2910 (E) 118 3195 (E) 121






(continued)




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Fantastic! I probably took the wrong approach with my local dealer shop. I need to show up with a case of beer for the tech and see if I can get mine adjusted also!

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My local dealer refused to adjust mine for liability reasons. They knew exactly what I wanted to do, but wouldn't do it. I've been running 53 in the front and 48 in the rear. They heat up to 56/51 when driving, but I still need to dismiss the warning on the DIC every time.

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I've already made up my mind that adjusting the tire pressure will be part of the "contract" I sign for a new one...either they adjust it or I'm on to the next dealer.

 

The liability thing is BS, they aren't turning it off, they are only adjusting it to a lower trip pressure...it's not like they are defeating it.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

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The liability thing is BS, they aren't turning it off, they are only adjusting it to a lower trip pressure...it's not like they are defeating it.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

Doesn't matter- if something were to happen and lower than recommended pressures were found to be the cause, they could certainly be held liable because the light didn't come on alerting you that the pressures were lower than what gm deemed necessary.

Don't ever underestimate the stupidity of our legal system lol.

For example, it is now our company policy to drill 1/2" holes in the sidewalls of our used tires so that they don't end up being resold, because if someone purchases a tire from a used tire place and tire blows out, gets in an accident and kills a family- the purchaser, used tire seller, and our dealership can now be held liable in the death of that family.

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yeah, so true. Give a enterprising lawyer from the law firm of Burn 'Em and Run half a chance and they will sue one blind. Sure enough, there is a risk involved if a dealer were to adjust down from where the OEM set things. This is yet another reason I despise this nanny state government crap that feels it needs to run around and wipe our little tushy because we cannot do it ourselves.

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