E rated tire with max psi of 65?
I have Nitto Ridge Grapplers that came on the truck when I bought it used, size LT325/65R18 E 127/124Q. Every E-rated tire I've ever seen is rated to carry its max load at 80psi, so the first trip ...
Forum Discussion
There seems to be some question about where I got my information that larger sized E Load Range tires use 65 psi max pressure rather than the usual 80 psi max - and that maybe onroad/offroad has something to do with it.
I have in front of me the 2020 Tire and Rim Association (TRA) Yearbook. TRA is the source standard for the load tables (among other things!) for US based tire manufacturers. In that book are ALL the current load tables for EVERY type of tire (except aircraft - separate book - and anything non-standard)
It shows many E Load Range LT tire sizes as having 65 psi max pressures as well as the ones we normally deal with (including sizes that aren't produced!) The tables do NOT refer to onroad/offroad as one of the parameters in determining the max pressure. However, it does reference changes in load carrying capacity for various speeds. (again, no change in the max pressure!)
And lastly, why do my posts take so long to show up? I normally post in the morning - part of my daily ritual. I only recently updated to a smart phone and haven't yet figured out how to connect it to my email alerts. Plus, does this site give email alerts? More things to learn about! (edit: When I clicked to post the above, I found how to get email alerts! Now to learn how to link the phone to my email so I get alerts!)
I have in front of me the 2020 Tire and Rim Association (TRA) Yearbook. TRA is the source standard for the load tables (among other things!) for US based tire manufacturers. In that book are ALL the current load tables for EVERY type of tire (except aircraft - separate book - and anything non-standard)
It shows many E Load Range LT tire sizes as having 65 psi max pressures as well as the ones we normally deal with (including sizes that aren't produced!) The tables do NOT refer to onroad/offroad as one of the parameters in determining the max pressure. However, it does reference changes in load carrying capacity for various speeds. (again, no change in the max pressure!)
And lastly, why do my posts take so long to show up? I normally post in the morning - part of my daily ritual. I only recently updated to a smart phone and haven't yet figured out how to connect it to my email alerts. Plus, does this site give email alerts? More things to learn about! (edit: When I clicked to post the above, I found how to get email alerts! Now to learn how to link the phone to my email so I get alerts!)
