DiskDoctr wrote:
Sure, you can try a little less pressure when empty, but for pete's sake, DO NOT UNDERFLATE TO 50%! Be smart. Find what works for your truck, but do not go outside the safe values ;)
50% is a safe value on an empty truck, not real tire smart are you??
In no way shape or form would that be under inflated.
DiskDoctr wrote:
Very DANGEROUS post there! :E
I was thinking the same thing about you recommending 72 psi in a EMPTY truck. There isn't a tire company out there that would do that. You decrease traction and increase the chance of a blow out/damage from a road hazard by running over inflated.
DiskDoctr wrote:
Unfortunately, you have read a chart and drawn ridiculous conclusions from it! Recommending 40-45psi for a tire rated for max inflation of 80psi is irresponsible and dangerous.
It's reccommended buy the companies that make the tires, why would they do that if it was irresponsible and dangerous?!?!?
Look here, Dodge must be irresponsible and dangerous too. 40 psi in 80 psi tires. Even at MAX load they don't recommend more than 60 psi in the front tires on 80 psi tires.
DiskDoctr wrote:
Running a tire at 50% (!) of its rated inflation is asking for trouble. It is grossly underinflated and is unsafe for ANY load or highway speeds!
You do realize that EVERY tire company disagrees with you right?
Again, reference the photo above. Right on the door of my 1-ton SRW pickup, light load 40 psi.
DiskDoctr wrote:
The PROPER interpretation of the table is, "Higher rated tires (E vs D vs C) are capable of higher load ratings ONLY when inflated to the higher psi as indicated on the sidewalls of the tire. Underinflation will significantly reduce the load capacity of the tire."
They only need to be at higher pressure when higher loads are applied, not all the time.
DiskDoctr wrote:
Read the charts, read the safety bulletins, etc. Generally speaking, if you inflate your tires under load to within 10% of the max inflation pressure listed on the side of the tire, the tire will perform as designed.
How about reading the charts and inflating to the pressure recommended for the weight? Novel concept huh.
Tires are not meant to be inflated to within 10% of max pressure all the time if the load doesn't warrant it.
DiskDoctr wrote:
BTW, I never claimed OP was running P rated tires, that was the example I had to offer...in real life...not some crazy 'inflate to 50% of max inflation psi' nonsense
Your post begs to differ. Directly from your post, with bold added for emphasis. I even left the spelling error.
DiskDoctr wrote:
The sidewalls are so much stiffermthan the original P-rated tires, they do not suffer from the overheat/risk that underinflated tires do.
DiskDoctr wrote:
To the OP- unfortunately, these kinds of irresponsible and ridiculous posts come out once in a while. It makes us cringe. The only reason we respond to such garbage is in an attempt to protect other readers from severely underinflating their tires and having accidents or blowouts.
It might make your uneducated idea's cringe, but don't let the facts effect your opinion.
I never once recommenced under inflating tires, re-read the posts. I recommenced PROPER inflation, per tire manufacturer specs and procedures. Not an over inflation like you did.
Tires are inflated to a pressure based on load, not to exceed the max load/pressure on the sidewall.
DiskDoctr wrote:
Thanks. Now I have another bald spot :D
Did you even open the link and read the charts? It's very clear you have no idea how load ratings and tire pressures work.
I have presented you with several facts and manufacturer evidence that back up my post, do you have anything other than an opinion to back yours up?
Look here. Lets assume your front axle has 2470 lbs/tire with a LT 265/70R17. You can have that size in a LRC, LRD, or LRE tire. All 3 tires want 50 psi for 2470lbs, regardless of max rating. But wait that's only 62.5% of the sidewall pressure of the LRE tire.. SO WHAT!!! What you fail to realize, and then criticize over, is that the sidewall pressure is for MAX load. At loads less than MAX you need less air.
Chock Full o' Nuts, I highly advise disregarding what DiskDoctr has mentioned, he is certainly not a TireDoctr and is disregarding tire manufacture specs and procedures for inflating tires. He thinks he knows better, but I would leave it up to the people that build the tires. I apologize the thread has gone this far off course, but the correct (and manufacturer supported) data needs to be given.
I personally am always changing my air pressure based on load, a properly inflated tire is the best for ride, tire life, road hazard, and most of all ride.
My current tires are LRG 110psi rated tires, that Les Schwab put 60/50 psi in based on the empty weight of my pickup. I use a similar inflation chart and increase the pressure based on what my axles will weigh. For me I know that empty or towing my front axle weights about 4800-5300lbs, so I run 60 psi nearly all the time. Summer time, on long trips I will bump it up to about 65 for a little added safety (as recommended). My rear axle varies from 3400-6500 lbs regularly and my rear tire pressure varies from 50-80 psi. None of that change makes the tires under inflated, even thou I have never ran the tires at more than 72% of their max pressure.
Even with low weight you don't want to go below 35 psi on a standard LT tire on a pickup, that's a manufacturer minimum in most cases.
