Tire Pressure?
I got new tires last year and am a bit embarrassed to admit that I relied on the tire shop to inflate them properly and haven't checked them since. Heading out on my first journey this weekend and...
Forum Discussion
Wich 8R19.5 tires do you have from the list, is it the E-load with 80 psi AT-pressure or the D-load with 70psi AT-pressure?
strange is that the D load has lower loadcapacity for the 70 psi pressure then the E-load , what would be expected is higher.
Best is to look at the sidewall for the right maximum load and loadkind, and try to determine the maximum speed of tire.
Mostly give as letter and I think for these sises it will be 75m/120km/h, wich is Speedcode L, N = 140km/87m/h.
Checked the calculation and was done with using power 0.7 for the E-load and even as low as 0.65 for the D-load in the list of the picture you gave.
This is what is done in America and is wrong ( I dare to state).
Europe uses for all kind of tires 0.8 power and the higher the power to 1 , the lower loadcapacity for the pressure .
Will give text I used for other topics with the data I need to calculate it for you . Can be off topic a bit , and some data you already gave ( GAWR's ). In spreadsheet I will use , I use my own determined formula that is to my conclusion closest to the ever to be constructed ideal formula to laws of nature, wich are the same over the world, and using this you can even go as low as zero pressure if the load is low enaugh.
Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).
So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.
This is from tires next and can be read from sidewall:
Maximum load or loadindex.
Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.
Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)
If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).
If you cant find all of it give sises of tire and Loadkind, then I will google for it.
From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.
Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.
strange is that the D load has lower loadcapacity for the 70 psi pressure then the E-load , what would be expected is higher.
Best is to look at the sidewall for the right maximum load and loadkind, and try to determine the maximum speed of tire.
Mostly give as letter and I think for these sises it will be 75m/120km/h, wich is Speedcode L, N = 140km/87m/h.
Checked the calculation and was done with using power 0.7 for the E-load and even as low as 0.65 for the D-load in the list of the picture you gave.
This is what is done in America and is wrong ( I dare to state).
Europe uses for all kind of tires 0.8 power and the higher the power to 1 , the lower loadcapacity for the pressure .
Will give text I used for other topics with the data I need to calculate it for you . Can be off topic a bit , and some data you already gave ( GAWR's ). In spreadsheet I will use , I use my own determined formula that is to my conclusion closest to the ever to be constructed ideal formula to laws of nature, wich are the same over the world, and using this you can even go as low as zero pressure if the load is low enaugh.
Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).
So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.
This is from tires next and can be read from sidewall:
Maximum load or loadindex.
Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.
Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)
If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).
If you cant find all of it give sises of tire and Loadkind, then I will google for it.
From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.
Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.
