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Toyo says for their tire size of 265/75R16 on a SRW truck the tires should be inflated to 70 PSI to just cover the GAWR of 6,100 lbs stated above. Source - page 21 https://www.toyotires.com/media/2125...s_20170203.pdf
At 75 PSI, the tires would be matched to 6,520 lbs...
At 80 PSI, the tires would be matched to 6,830 lbs...
So, between the "recommended" PSI of 70 and the max PSI of 80, there are 620 lbs of support difference... Not that much when you are counting apples to apples...
Maybe I am wrong with my math, I am wrong all the time...
Originally Posted by pirate4x4_camo
for all you inflate to max sidewall psi guys, remember to inform people you are trying to convinne to overinflate their tires that your breaking distances are vastly increased since you have considerably reduced the tires traction.
I for one, was not trying to convince anyone, just stating what I run and how it works for me which is clearly shown (in my opinion) by the wear pattern or lack there of I am receiving from the Cooper ST MAXX tires I have mounted.
Based on your recommendation and the recommendation from Toyo, I would say people running tires between 70 and 75 PSI are not too far off the mark and do not need to convince anyone. Granted I have not looked up the manufacturer recommendation for the Cooper tires I run, because I have great success with them for the past 35,000 miles and am looking at another 35,000 miles based on their wear.
For anyone not wanting to scroll up to see what the pressures I run on my truck are, I have quoted myself below...
Originally Posted by Sous
I run 72 psi front and 78 psi in the rear year round, loaded, unloaded, Tuesdays, Saturdays, whatever.
I have ~38,000 miles on my Cooper STT Maxx 265/75R16 tires and they look to be about 50% worn.
I will stick with this pressure for as long as I own the truck.
regardless of who makes your tires that chart is going to apply because it isnt manufacture specific.
just like underinflation will cause internal damage to a tire by over heating it, every pound of over inflation lessens your availble traction for braking and cornering as well as compromises ride comfort. with modern radial tires over inflating them does not lead to less rolling resistance or prolonged tire wear, just a poor ride quality and longer braking distances.
I wouldnt rely on the internet for your axle weight ratings, check the sticker on your door Jamb as that is specific to your truck.
the sticker on my Excursion door jamb with a 10.5 sterling has a rear GAWR of 5250 lbs and the recommended tire pressure on the sticker is 55 psi
which matches exactly the Load and Inflation charts say. 55 psi for 2625 pounds per tire in the rear.
Originally Posted by pirate4x4_camo
regardless of who makes your tires that chart is going to apply because it isnt manufacture specific.
just like underinflation will cause internal damage to a tire by over heating it, every pound of over inflation lessens your availble traction for braking and cornering as well as compromises ride comfort. with modern radial tires over inflating them does not lead to less rolling resistance or prolonged tire wear, just a poor ride quality and longer braking distances.
@pirate4x4_camo, duly noted... It was simply an example after 10 seconds of searching via Google. My truck is parked in the back of my property next to the woods, so it takes far less time to Google Fu the information (which I have a SB SC not like one in the link above) rather than go look at the sticker.
Because you peaked my interest....
I went out and checked the sticker on my door and came up with the following...
Front
4800 GAWR
60 PSI recommended
Rear
6084 GAWR
80 PSI recommended
Based on the Toyo chart, I should be running (if I had Toyo tires) my front tires at 50 PSI and rear at 70 PSI. No F-ing way I would run the front tires at 50 PSI, but that is just me and how I maintain my truck. The rear... Well that is pretty close to what I wrote about earlier.
I am getting great mileage out of a somewhat offroad tire at the pressures I mentioned above. 95% of the 38,000 miles I noted above are towing the 12,000 lbs 5th wheel.
Again, I am not telling anyone what they should do, but I think I am dead on with my pressures and will continue to run them as such.
The milage you are getting out of your tires has more to do with the construction of the tire and the tread compounds then the psi you are running. First and foremost you need the correct psi to support the payload and then small psi changes to tune handling, traction and ride comfort.
Doesn’t matter if you are running Toyo, BFG or ChinaPops, The chart applies to all manufactures.
I was going off what you wrote earlier which I have quoted below. I read it as each manufacturer has recommended PSI pressures that they publish, even if they may be identical or very similar to another manufacturer, but could be dramatically different as well. I apologize for interpreting your written words incorrectly. Although, my statement still stands that there is no way I am running 50 PSI in my front tires...
Originally Posted by pirate4x4_camo
as a Rule set your tire pressure to the Gross Axle weight Rating published by any of the manufactures. ( you can typically lower the rear 5 psi when not carrying a payload) here is Toyo's https://www.toyotires.com/media/2125...s_20170203.pdf
Misinformation may run rampant at times, but that is what the internet and forums are known for. At least we here at the FTE can keep most "internet truisms and lore" at a minimum. Fake news everywhere!
Thank you for your detailed and factual information you have posted. Although, I will continue to be the one rolling down the road with 70,000 miles on tires over inflated by 22 PSI on the front!
I also use the load and inflation tables, however I add some to allow for uneven side to side loading (at least 10%). From the scale ticket you can see my front axle weighs in at 5,080 with full fuel and 2 passengers. 5080/2=2,540x1.1=2,794 which puts me into the 55PSI column for my 275s. I actually have them at 60 but as soon as I get some chaulk I will fine tune that per Colorado's suggestion. My rear axle weighs in at 3,780 with the camper shell, interior kit, tools and some spare parts/fluids and an ice chest and 2 suitcases. 3,780/2=1,890x1.1=2,079 which puts me in the 40 PSI column, however I keep them at 55 unless towing. I will order some chaulk and experiment with it.
Bigb56, what do you air the tires up to when you are towing and what sort of weight would you be towing at?
My wife has some chalk that I will borrow and run up and down my driveway since it is long and concrete. I will do that when we return from our camping trip.
My curiosity has been peaked and I may learn something with the method John posted. My tires are wearing evenly and very well, but if I can get 80,000 miles or more out if them, then the few minutes it takes to draw chalk lines might save me some cash in the end.
Bigb56, what do you air the tires up to when you are towing and what sort of weight would you be towing at?
I haven't bough a TT yet but what we are looking at has a tongue weight of around 1K. We did tow a Forest River 27 foot but I never weighed it and I ran the rears at 80 when towing it, but since then I have learned a lot about tire pressure on the RV forums. Once we buy our TT I will be figuring it out with scale numbers and chaulk and hopefully arrive at a safe, happy medium.
I find this stuff confusing. So I plead guilty to running my tires 5 psi under the max pressure listed. My 5th wheel tires are at full 80 psi.
I did find that running my front tires at 50 psi (which is where they were when I bought it from the previous owner) made the ride more comfy but negatively affected the handling.
Thanks all for input in two weeks it is getting lined up at a shop that specializes in larger trucks my F350 is on their small side. He’s been in business for 20 years and still on the floor working not in the office. Second will be. Tire rotation with all six getting to do time on the front and about 3k miles was doing it at 7-8 k interval I’ll move the ugly steel rims to the front and live with it. I put about 25000 miles a year on a vehicle so my rims should not get sticky. And third I’m going to do the chalk line thing.
Shawn
I haven't bough a TT yet but what we are looking at has a tongue weight of around 1K. We did tow a Forest River 27 foot but I never weighed it and I ran the rears at 80 when towing it, but since then I have learned a lot about tire pressure on the RV forums. Once we buy our TT I will be figuring it out with scale numbers and chaulk and hopefully arrive at a safe, happy medium.
I have a 35 foot Forest River Hemisphere.... it is a big boy. I run my tires at 80psi when pulling this thing and I have pulled it all over the country. I have 'Tire Mindesr' that look at the Temp and psi. When the Temp goes waaay high... the psi will go up... if it the psi gets to 90psi... I will let some air out of the tire to bring it back down to 85psi.
Sous said:....Granted I have not looked up the manufacturer recommendation for the Cooper tires I run, because I have great success with them for the past 35,000 miles and am looking at another 35,000 miles based on their wear.
Yep, Highway miles, my Coopers seem to go forever, on my second set that I have bought since I have had the truck. The original tires were on the truck when I bought it and I am on my second set that I have bought. I have almost 200,000 miles on the truck and this '3rd' set shows almost no wear. Is this '3rd' set 'old'? about 3 years old. I know that some (many) of you will say that I kept the tires on too long.... yes... by most standards, 5-8 years too long. Hence, the 'Tire Minders'. In reality, I have had more issues with the Valve Stems wearing out, more than the tires wearing out.... Hence, the Tire Minders'.
