What tire pressure should I run?

[ecocruze]

I'm finding the tires do seem to last a bit longer due to less sidewall flex generating heat. This is at the cost of a more uncomfortable ride. As believe I stated before in the earlier pages of this thread the suspension will take more wear from the lessened effect of the tires absorbing impact from irregularities in the road. In my eyes since newer cars now the suspension system is built cheap. I will need to replace parts with aftermarket sooner or later and might as well be sooner since they build suspensions with plastic in them now. I will be going with Moog probably for some non plastic end links here within the next 30k and probably some Bilstien shocks all around (if bank account agrees). Reduce sway and economy increases when your suspension keeps tires in contact with road better. Needless to say a lifetime warranty shock from a reputable company is built to handle absorbing all road irregularities and riding at sidewall or 10% higher won't be any issue. Increased pressure has extended life on many peoples tires as I have seen from countless threads but if your on rough roads with a worn suspension your probably better off lowering pressure a bit 10-15% below sidewall max always has seemed to be the most comfortable and performance worthy to me. Most of my cars have been between 32-35 recommend max psi with either 44 or 51 psi max sidewall. So more or less 38-40 psi for 44 max and 42-45 psi for 50 psi is were I have found the best.

[LioNiNoiL]

For the past three years, I've been running Prodigy (Yokohama) H/T "Light Truck" 51psi-rated P235/75R-15 tires on my Blazer at 40psi, recommended locally because heat here in Las Vegas is a much-bigger contributor to tire failure than anything else, and higher pressure reduces heat from less sidewall flex. Predicted high temperature tomorrow-through-Thursday is 106°F

[JockoT]

Heat in the tyres, here in Scotland, is not really an issue. A high temperature here, this month, might get up to 70°F.
If we get a hot month!

[ecocruze]

Idk I picked up a used set of tires for 50$. Previous owner says should be able to get about 20k miles out of them. I feel like I can get closer to 40k since it's a 60k tire. I feel it had over half treadlife left. When these are worn out or lose traction I will be going back to a LRR tire. I don't put on too many miles though so may dry rotted these ones before the tread is gone. On top of buying used tires I did my own redneck alignment. So we will see. Tread is wearing perfectly as of now.

[Frank Lee]

Originally Posted by LioNiNoiL

For the past three years, I've been running Prodigy (Yokohama) H/T Light Truck (LT) 35psi-rated P235/75R-15 tires on my Blazer at 40psi, recommended locally because heat here in Las Vegas is a much-bigger contributor to tire failure than anything else, and higher pressure reduces heat from less sidewall flex. Predicted high temperature tomorrow-through-Thursday is 106°F

If it's a P235 it's a passenger car tire. If it's a LT235 it's a light truck tire.

[LioNiNoiL]

Originally Posted by Frank Lee

If it's a LT235 it's a light truck tire.

It was called "Light Truck" at the dealer, I checked and it is P235, I was bleary-eyed late last night.

[CapriRacer]

Originally Posted by LioNiNoiL

You're right, it's LT235, I don't know why I wrote P235

No, I don't think so.

1) You quoted a 35 psi max - and that only occurs in P type tires. LT235's would be 50 psi max (or more!)

2) I can only find P235's in the Prodigy line.

[PaleMelanesian]

I have personally see better and more even tread wear with elevated pressure. At the specified pressure the shoulders wear down while there's still good tread in the center. At sidewall max 51 psi, even wear across the entire width for the whole life of the tires. Running at the lower pressure means I have to replace the tires sooner, so higher pressure is actually saving me money on tires as well as gas.

I have seen this on multiple vehicles and several brands and models of tires.

[ptjones]

I have a 2013 FORD CMAX Hybrid with Michelin Energy Saver tires with 159k mi. I talked with Michelin Customer service and explained I was getting even tire wear at 50psi and got 64k mi. on two sets of tires. Tires are warrantied for 55k mi. He said he had no problem with that and would recommend 50psi. I think it makes sense to do what the experts at Michelin recommend. The Max pressure on the tire is 51psi cold and it would take about 200 psi to blow up the tire. Some are running 55 psi. on these tires too. FORD's recommended tire pressure of 38psi is only a recommendation and is a compromise between ride quality, braking, handling, gas mileage etc. Even tire wear is the important thing here, IMO

Paul

[Prophecy99]

i did 44 psi for a long time, it worked fine, def stiff, and less grippy,
but on my summer shoes 18x7.5 35mm
i then switched from tires 225/40/R18 to 235/45/R18 both had 50 psi max on sidewall

and by having the 44psi and the extra wider tires, i got horrible center wear. i am currently affraid to go much higher than 38 at the moment w this size, to keep my tires nice and enjoy more grip and softness.

no center wear issues on the old tire size though.

so all this calculation stuff seems legit