D to E rated tires
Thinking of going from 8 ply tires on my fiver to 10. It will involve upping pressure from 65 to 80 psi. Nothing but mfg. date on my wheels. Should I be concerned about the extra pressure as far as my...
Forum Discussion
If LT tires you probably need for E-load about 70 psi to get the same loadcapacity as the old D-load. but if you have ST tires you probably would have needed even 75 psi for the D-load/8pr tires to give the tire a deflection , so heatproduction and fuel saving , a comparing LT tire would have .
Then going from D to E-load ST tire would need that 80 psi .
Steel valves is not absolutely needed for E-load , there are also HP rubber snapp in valves that are made for up to 95 psi cold pressure ( so warm higher ). those are yust as easy to fit in the rimm and about same price as normal rubber snap in valves, and can be replaced with every tire chanche.
Ofcource the rimms must be allowed 80 psi then, but that is also given for cold pressure , so must have some technical reserve above that in absulute pressure. So my conclusion is that rims have such a reserve above what is given that using a little higher cold pressure wont damage the rimms that soon.
For that reason I would rather risk going over rimm allowed pressure, then using to low pressure wich can damage the tires and give accidents with damage to trailer or worse injured or dead people.
With this I wont legalise to put a 80 psi tire on a 65 psi rimm, but when putting 65tire on 65rimm , using 75 psi wont give damage to the rimm.
Only found one message about leaking rimms from Dutch rimm maker Prins, that went leaking when going from normal tire ( P-tire with At-pressure of 36 psi in EUR system) to D-load/8pr ( 65 psi AT-pressure).
There the link between allowed rimm-pressure was not made, so I wrote it in the topic. Using 6PR/C-load ( AT-pressure EUR 55psi USA 50 psi ) would probably have given no problems for that rimm.
All my own opinion, burn me down, but with good arguments.
Then going from D to E-load ST tire would need that 80 psi .
Steel valves is not absolutely needed for E-load , there are also HP rubber snapp in valves that are made for up to 95 psi cold pressure ( so warm higher ). those are yust as easy to fit in the rimm and about same price as normal rubber snap in valves, and can be replaced with every tire chanche.
Ofcource the rimms must be allowed 80 psi then, but that is also given for cold pressure , so must have some technical reserve above that in absulute pressure. So my conclusion is that rims have such a reserve above what is given that using a little higher cold pressure wont damage the rimms that soon.
For that reason I would rather risk going over rimm allowed pressure, then using to low pressure wich can damage the tires and give accidents with damage to trailer or worse injured or dead people.
With this I wont legalise to put a 80 psi tire on a 65 psi rimm, but when putting 65tire on 65rimm , using 75 psi wont give damage to the rimm.
Only found one message about leaking rimms from Dutch rimm maker Prins, that went leaking when going from normal tire ( P-tire with At-pressure of 36 psi in EUR system) to D-load/8pr ( 65 psi AT-pressure).
There the link between allowed rimm-pressure was not made, so I wrote it in the topic. Using 6PR/C-load ( AT-pressure EUR 55psi USA 50 psi ) would probably have given no problems for that rimm.
All my own opinion, burn me down, but with good arguments.
