18" alloy wheel pressure rating

I have the factory stock 18" alloy wheels with the P275/65R18 tires. I am interested in replacing the tires with LT tires which will be better for towing my camper. Does anyone know the pressure rating for the wheels? Need to know if I will have to upgrade the wheels if I run pressures above 50 psig. Couldn't find any pressure info inside the wheel.

 

You will have no issue with LT tires on your rims. Many, maybe most of us run LT tires on the stock rims. Moving to an LT and usually E load is pretty much required if someone wants to install a larger tire on a tundra with 18 inch rims.

 

Thanks for the quick reply.

 

My 2010 Tundra has the same 18" alloy wheels with the P275/65R18 tires and Firestone Transforce HT tires. The tires have 80 psi. max but when I bought it they had 50 psi. in them. Firestone said go with mfgr recommended pressure which is 30 and 33psi. What do you guys think?

 

When you run P-metric tires the tire OEM will tell you to use the vehicle mfg. recommendations because they don't publish load/pressure charts for p-metric tires. Toyota customer service will tell you to use pressures on the door post (too many lawyers). My guess/concern is that Toyota sets the sticker pressures for comfort and ride based on a lightly loaded truck. If you don't tow or carry much in your truck you can run the sticker pressures. If you run near the GVWR you need to run higher pressures to safely support the axel load. If you use LT tires, the mfg. should be able to provide you a load/pressure chart. Then all you have to do is hit the CAT scale when loaded up to determine your axel load and then pressure the tires for your load.

 

FWIW....

LT is overkill even in a C.

A LT C rated tire capacity surpasses the GVWR.

 

True, but the LTs have a stiffer sidewall which is beneficial when towing.

 

While that is a pro, there are a lot of downsides to running an LT tire. That's for the each person to weigh out themselves.

 

I was considering moving to LT tires when the original equipment tires need replacing since I tow a camper. Can you educate me on the downsides?

 

Weight = rotational mass = worse everyday fuel economy, ride quality diminishes , handling characteristics, cost (not always), tread life - to name a few

 

Got it. All things to consider. Thanks