Quote:
Originally Posted by CapriRacer
Sorry, but most of this post is incorrect.
If I look at Tire Guides - a publication that summarizes the tire placard information for easy reference - GM trucks, vans, and SUV's use 35 psi for P metric tires (when they use those). There are a few exceptions.
I was going to say that GM cars tend to use 30 psi, but a quick perusal of the latest Tire Guides says that that is no longer true - that the recent tire pressure specifications are all over the ball park (range 30 to 36 psi).
The post has an indirect reference to the Ford/Firestone situation some 20 years ago - and 1) The failure was NOT in the sidewall. It was a "Belt leaving Belt Separation" (commonly called a tread separation) and 2) The cause was a combination of the tire design, and the manufacturing, not the inflation pressure. I go into detail here: Barry's Tire Tech
There also appears to be a misconception by the mechanic that the max pressure is close to the burst pressure of the tire. Tire burst pressures are on the order of 2 to 4 times what the max on the tire says.
Lastly, it was stated that high inflation pressures do not generate pressure buildup - ah ….. not exactly.
There is pressure buildup any time a tire is operated. The question is how much.
Normal city street driving doesn't generate much (1 or 2 psi), while freeway driving generates more (up to 3 psi). Obviously using a higher than placard pressure would reduce the amount, but it is not zero.
Most pencil style tire pressure gauges measure in 1 psi increments, so 1/2 psi build up would be undetectable by those.
Hope this helps clear things up. |
officially shown on the sticker on the driver side door 2018 model
i use digital ones they have 0.5psi increments
ford explorer tires blowout google it
was more at the side wall rather then the tread it self
the tread and sidewall failed simultaneously
if the tread left the tire it might still be drive able to come to a stop but a lot of noise
as seen here
i'm sure if you heard that noise you would be slowing down, notice when the tread separates it does not go flat instantly
a side wall blow out goes flat instantly (i personally seen it happen to a pickup truck at 75MPH) the pickup truck was in the next lane over
normally when i think of the tread leaving the tire I'm thinking of the retreaded 18wheeler tires
i dealt with tread separation Firestone tire (flat hard spot i might be able to dig up a photo) and bridgestone tire
here is a photo of tread separation on my bridgestone tire you can see the tire is warped that is because the tread is coming apart..