Question about tires

[Heybro]

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 has Goodyear 275/55R20 113T tires. It says the treadwear is 500, Traction B, Temperature B. It also says the max load is 2535 lbs, and max psi is 51.

My GAWR on my truck with those tires is 4000 lbs on the front, and 4150 lbs on the rear.


Ok, with that information, how do I figure out if I am good to tow a 7,000 lbs GVWR trailer, with 680 lbs of dry tongue weight without having a tire blowout? I heard something that you need D or E rated tires if you are going to tow. But it looks like my tires can handle 2535 lbs each, so shouldnt i be fine?

[Cummins12V98]

MFL wrote:

Cummins12V98 wrote:
I wish I was Barney’s favorite. 😉

Hey Ron...I'm not a member of distinction, but you are one of my favorite posters. I've always enjoyed Grits posts as well, and have told him so. :C

Jerry

Same back at ya! We should be able to kidd around now and then.

[MFL]

Cummins12V98 wrote:
I wish I was Barney’s favorite. 😉

Hey Ron...I'm not a member of distinction, but you are one of my favorite posters. I've always enjoyed Grits posts as well, and have told him so. :C

Jerry

[MFL]

JIMNLIN wrote:
CapriRacer and Tireman9 have both told us (for those that don't know them, both are tire engineers) for years a P metric tires max load capacity comes at 35 psi...even tho they may have a 44-51 max psi on the sidewall.
Higher pressures above 35 psi just stiffens the tires sidewall...but doesn't gain any more capacity.

And both engineers have also told us the OPs 275/55-20" tires has a 113T load rating/2535 lb capacity = a P tire. P tires on a truck are required to have their load rating derated by dividing its capacity 1.1 = 2304 lbs capacity. Still w/i a 1/2 ton trucks rear axle ratings.

Pump those P tires on the trucks rear axle to the max sidewall when towing...or carrying max loads.

[COLOR=]"Pump those P tires on the trucks rear axle to the max sidewall when towing...or carrying max loads."

This from a man with actual experience, towing heavy over many years! Nothing wrong with being schooled from a book, but schooling from others with actual knowledge from towing heavy trailers can improve the safety of anyone's towing experience, which includes a member mentioned above.

In my years on this forum, it seems everyone on this forum has claimed to be an engineer of some sort. Guess I'm the only one that isn't, but get by, using common sense, and experience.

Jerry

[Cummins12V98]

I wish I was Barney’s favorite. 😉

[JIMNLIN]

CapriRacer and Tireman9 have both told us (for those that don't know them, both are tire engineers) for years a P metric tires max load capacity comes at 35 psi...even tho they may have a 44-51 max psi on the sidewall.
Higher pressures above 35 psi just stiffens the tires sidewall...but doesn't gain any more capacity.

And both engineers have also told us the OPs 275/55-20" tires has a 113T load rating/2535 lb capacity = a P tire. P tires on a truck are required to have their load rating derated by dividing its capacity 1.1 = 2304 lbs capacity. Still w/i a 1/2 ton trucks rear axle ratings.

Pump those P tires on the trucks rear axle to the max sidewall when towing...or carrying max loads.

[MFL]

BarneyS wrote:
Sorry Jerry but I have no answer for you. I don't know.
By the way, my previous post was not directed just to you but to any other members who may think I try to play favorites.:)
Barney

Thanks for the reply, hope you know I was kidding about you playing favorites. Anyway you and Marty are my favorite mods! 🙂

I'll watch for the post made at 2:50, right after my 11:51 am post this morning. Weird, but it may still show.

Jerry

[BarneyS]

Sorry Jerry but I have no answer for you. I don't know.
By the way, my previous post was not directed just to you but to any other members who may think I try to play favorites.:)
Barney

[MFL]

Thanks for the explanation Barney, maybe I was being a bit condescending.

I do have a question, that you maybe will answer? Although I've noticed this happen quite often, just today, on this thread, a post was made at 2:50 pm, but the post does not show up for me?? It may show up in a day or so, just curious why?

Jerry

[BarneyS]

Nobody has complained to me about anything and it is not a matter of liking or disliking anybody. I just delete any comments that are personal in nature. If you wish to say something directly or indirectly to another member that is even somewhat flaming or derogatory, then do via PM and not on the public forum.

The alternative to editing out comments such as those, is to delete the whole post. If I did that then you would complain about that so might as well just take out the personal stuff.
Barney

[Grit_dog]

MFL. Pretty sure the OPs tires are not LT with only a 113 load index, but then again I’m not a wannabe tire engineer.
However I do know enough to know that most, many, all? Probably not all, light duty P/XL tires achieve max rated capacity before max psi rating.
But ICBW , and always welcome some new knowledge if I’m wrong.

Just doing my due diligence to keep all the newbies from walking away thinking they need E load tires and a dually as soon as they even think about putting a trailer on the back of a truck.

[MFL]

Cummins12V98 wrote:
Glad I am not deleted. 😉

Your a nice guy, Barney likes you! :C But hey, I like Barney! I think he was maybe just responding to the tire jockey's complaint of me picking on him. I didn't intend it that way, just gave him a few tips.

Jerry

[Cummins12V98]

Glad I am not deleted. 😉

[MFL]

Been a while since looking at this thread! Looks like the safety part of my post has disappeared.

The fact is the OPs tires are LT, but with most any 1/2 ton truck tire, as you agree, MORE PRESSURE, but not going over max tire psi, will net best stability and safety when towing a heavy trailer. Experience tells you and I from towing many types/weights of trailers, often with 1/2 ton trucks, you do not want the door sticker pressure in tires with 1K TW on the hitch. The fellow posting this recommendation is not "smug" but sending a dangerous message.

Grit dog...not sure what your first sentence was implying, but you are welcome to PM me for further discussion, to avoid any more deleting.

Jerry

[Grit_dog]

As smug as CR can be sometimes, maybe don’t show your ____ without knowing all the facts.
What you’re saying IS generally true for LT tires, but P metric tires generally max out on load before maxing out on pressure. BUT more pressure above the min psi to get max load rating does increase stability and make the tire flex less for a given load.

[MFL]

Understanding your tire ratings 101...Yes, you need to air up to get full load capacity of the tire! What is it you can not understand! A reading comprehension problem, maybe! When a tire is marked (example to make it easier for you) max load 1984 at max pressure 44 psi, that does not mean that tire has 1984 load capability at 30 psi. If you can read the tire manufacturers charts, they will tell what the load capacity is at a lesser inflation.

Bottom line...a little common sense...air your tires up to handle the load, but do not exceed max pressure as marked on tire. I am taking the time to school you, so others don't take your wrong advise of just looking at the door sticker, when they need to air up to handle the increased load, such as 1,000 lbs of tongue wt.

Jerry