BassAckwards

Hello all!

I wanted to share a resource I have compiled together for all of you to use. It is useful for more than just our trucks.

I have a Tire Load Index Chart that I am providing to everyone free of charge, that I have compiled myself.

What is this you ask? A Tire Load Index chart tells you what a specific size and load index tire can handle at any given psi.

What do I need it for? Well if you put a different size tire other than stock on your vehicle, it may require a different air pressure in order to handle the weight of your vehicle and maintain ride and handling properties.

How do I use it? Look at how much weight your stock size tire holds at the manufacturer recommended psi. Now look at how much air it takes for your new tire to hold that same amount of weight. This will also show you the minimum air pressure needed to carry your vehicle and other important things to know.

The TIA offers this to the public in what they call a "Yearbook" however it costs ~$100.
Mine isn't complete, but I will continue to keep it updated as I can. Haven't been able to find a chart for G-Load Range Trailer Tires ....yet

I originally made this for quick reference on my phone at work to answer air pressure questions for customers, but I have found myself using it increasingly more to answer questions here on the board.

Anyways enough babbling. Here y'all go! If you have any problems understanding it post in here and I will answer as soon as I can. It may have a few typos (Like extra characters that shouldn't be there) but all the weight numbers and tires sizes are correct. It's a really big spreadsheet though so it's hard for me to proof read the whole thing.

https://docs.google.com/spreadsheets...it?usp=sharing

For P-Metric Tires you will notice a Note A and Note B column etc, I will explain.

36-51psi Note A: Means this P-Metric tire may have a max psi up to 51psi but it is only a standard load tire and therefore will not gain any extra weight carrying capacity beyond 36psi. The max air pressure is used to meet the speed rating.

36-51psi Note B: Means this Euro-Metric tire may have a max psi up to 51psi but it is only a standard load tire and therefore will not gain any extra weight carrying capacity beyond 36psi. The max air pressure is used to meet the speed rating.


41-50psi Note C: Means this P-Metric tire may have a max psi up to 51psi, and is rated at XL (Extra Load) or RF (Reinforced), and it's max weight capacity is reached at 41psi. Anything beyond this is to meet the speed rating.

42-51psi Note D: Means this Euro-Metric tire may have a max psi up to 51psi, and is rated at XL (Extra Load) or RF (Reinforced), and it's max weight capacity is reached at 41psi. Anything beyond this is to meet the speed rating.

Truckin

iTrader: (4)

Cool..looks like good info!

Manuellabour247

sub'd for future

BassAckwards

Looks like we got a sticky! Hope this helps people build a better understanding on air pressure in tires.

bobkyle2

Stickied!

Feathermerchant

Looks like it covers P-metric and Euro-metric tires only. No LT tires?
I ask because I and many of us run LT tires.

BassAckwards

There is a separate tab for LT tires as well as Trailer tires and Flotation tires. This is the first time I have opened the spread sheet on my phone and it doesn't fit the screen well but there is a tab at the top for LT tires if you are looking on your phone.

Hope that helps and thanks for looking!
Will update this soon with a non-size based format that is a little easier to search through.

kmlacroix

Tire inflation Info

LabRat

Thanks for the info. I have a 2007 FX4 OEM rims, and I have been tire shopping. Heading to Les Schwabs today. Doing some comparison shopping I came across load/speed ratings that you don't have covered. Looking at Toyo Open Country AT2 275 65 R18 and on Walmart and Amazon there is an additional measurement "113S" and "113T"? Now, what in the wild world of sports does this have to do with the price of tea in China??? I'm guessing it has to do with ply numbers? I use my truck for everything, jetting down the freeway at 80+, heading into the mountains to get firewood, and trudging through snow and ice to get where I need to go. So, I could use some guidance here.

Thanks.

Feathermerchant

The letters are a speed index:
https://www.goodyear.com/en-US/tire-...x-speed-rating
The numbers are a load index:
http://www.tiresplus.com/tires/tire-...d-index-chart/