Question about tires
I have been learning a lot about tongue weight and payload capacity lately, but I have not even looked into tire capacity and weight rating at all. I am going to need some help with this. So my truck ...
Forum Discussion
Boils down to understanding...or not...of what a rating is...and in this topic...reference to tires.
Let out all the PSI from a tire with the vehicle weight on it
Rim will be down to pavement with the tire carcass between them
Air up and at some PSI point, the rim will lift the vehicle weight off the pavement
Continue airing, increasing the PSI and the rim will lift even higher, as now the tire ‘can’ carry more weight
Then up to the PSI as mentioned by one of our resident tire engineers (CapriRacer) and is the ‘rating’ for ‘that tire
Increasing the PSI will have the tire be able to carry more weight, but it will not be ‘rated’ for it (same metric for discussions of TV ratings and what they can carry/tow)
That increased PSI over max rated weight carry is more to keep the tires shape during its multitude of duty’s...carry weight, braking, accelerating, cornering, etc, etc, etc
Sure it ‘can’ carry more, but not within the specifications published (labels, brochures, specification sheets, etc) and be able to meet the criteria employed during design and certification testing.
That is where comments of : “into the safety margins” means. It will do it...but how long, how safely, etc. Big one is duty cycle and that is another area not understood by too many.
Gives me a headache trying to explain designed to specifications and ratings. What is baked into that design is lost to those who do not understand the process
This is a ditto for everything engineered or designed to a specification
One example that has worked on one of my old forums...with shooters/reloaded. They understood receiver/chamber pressure ratings. Sure you can increase the powder charge to increase the pressure and have the bullet fly faster/flatter/farther/etc...but they understood that it might work for a while or instantly fail...but the understood that it WOULD fail sooner or later...the working load and breaking load of a rope also worked for non shooters...
Aspirin anyone ?
Let out all the PSI from a tire with the vehicle weight on it
Rim will be down to pavement with the tire carcass between them
Air up and at some PSI point, the rim will lift the vehicle weight off the pavement
Continue airing, increasing the PSI and the rim will lift even higher, as now the tire ‘can’ carry more weight
Then up to the PSI as mentioned by one of our resident tire engineers (CapriRacer) and is the ‘rating’ for ‘that tire
Increasing the PSI will have the tire be able to carry more weight, but it will not be ‘rated’ for it (same metric for discussions of TV ratings and what they can carry/tow)
That increased PSI over max rated weight carry is more to keep the tires shape during its multitude of duty’s...carry weight, braking, accelerating, cornering, etc, etc, etc
Sure it ‘can’ carry more, but not within the specifications published (labels, brochures, specification sheets, etc) and be able to meet the criteria employed during design and certification testing.
That is where comments of : “into the safety margins” means. It will do it...but how long, how safely, etc. Big one is duty cycle and that is another area not understood by too many.
Gives me a headache trying to explain designed to specifications and ratings. What is baked into that design is lost to those who do not understand the process
This is a ditto for everything engineered or designed to a specification
One example that has worked on one of my old forums...with shooters/reloaded. They understood receiver/chamber pressure ratings. Sure you can increase the powder charge to increase the pressure and have the bullet fly faster/flatter/farther/etc...but they understood that it might work for a while or instantly fail...but the understood that it WOULD fail sooner or later...the working load and breaking load of a rope also worked for non shooters...
Aspirin anyone ?
