Munkeebutt

I don't even have the regular tow package. My payload capacity is only 1478 lbs. The c-rated tires were just a separate add on for my truck.

jp2012

Oh crap, you're right. I'm an idiot. I have the HT's.
That's a big difference in pressures.

patrickoneal

The pressures are set based on the maximum weight on each axle with some safety margin, I would assume. Here is the pressure-load chart for the size in question:



These values come from here:

https://www.toyotires.com/media/2125...s_20170203.pdf

If you're looking to move from P tires to LT, or just changing size, I believe the process for selecting the appropriate pressure is as follows:

1. Look up the weight capacity for the factory tire size at the OEM specified pressure.
2. Find the replacement tire on the chart and find the closest weight to the value you found in step 1, and see what pressure is specified.
3. Inflate the new tires to the pressure you found in step 2.

CoreyMS

I find it odd that my 18 max tow has normal Michelins, 35 psi but my gvwr is higher, 3800 on the rear. You'd think it would be the other way around.

mechanicaladvantage

elptxjc

My truck has the max tow package, and my payload is even lower than yours: 1,458. My tires are A/T due to having the FX4 package, with 35 psi recommended. I've never heard of 'C-rated' tires. What's that? Commercial? Just curious about that. Since I can't hear the tires on the highway, I plan to stay with A/Ts, or my truck would look funny with regular A/S tires, but let's see how long they last. I'll probably never use the truck for 4-wheeling. Bought it 4x4 for the safety (and resale) aspect, not for off-roading. I want the quietest, lightest, and longest lasting tire I can get when it's time to change. Truck came with Hankooks, which I thought were crap, but people keep b*tching about the Wranglers, so maybe not. Ha ha. Thx.

gDMJoe

Goodyear Wrangler AT/S "Light Truck 275/65R18 OWL All-Terrain Tires"

patrickoneal

Tires come in P(passenger car) sizes and LT(light truck) sizes. A lot of 1/2 ton trucks come with P tires. They ride better and are typically less expensive. LT tires have more layers and are a lot stiffer. They are made to be safely loaded to capacity for the life of the tire. P tires really should be loaded to the maximum capacity every once in a while. LT tires are typically available in three load ranges: C, D, and E. An E rated tire at full inflation carries more weight than a C or D rated tire at full inflation. The maximum inflation for E rated tires is also higher than D and C, and the same is true of D rated tires in comparison to C. Some people that drive off road like to buy LT tires for better puncture resistance even if they never use the weight capacity.

elptxjc

Thanks brother. Greatly appreciated. I assume it says on the tire if it's C, D or E, correct? I have to check my label, but assume my A/T tires are LT, since I have the max tow and FX4 packages. Just to know what to replace my current tires with if I find better ones. Thanks again.

patrickoneal

It's usually spelled out on the sidewall as "Load Range C" or "LT275/65R18C". Load Range D or E tires will ride slightly rougher if you move to them.

For street tires, I really like the Michelin LTX M/S2 and it's newer replacement model the Defender LTX M/S. They're only available in Load Range E in the LT sizing. That's all I run on my fleet of work vans and pickups. They're great in the rain, decent in the snow, and they seem to last a long time. It's what I'll be going to when the factory Goodyears wear out.

Edit: If you want off-road tires, it's hard to beat the BFG T/A KO2. They will be noticeably louder than the above mentioned Michelins in exchange for much better off road traction.