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A lot of the places I go will destroy P rated tires in as little as one trip. I recently put on a set of bfg KM03 mud terrains against my better judgement and am super happy with how they ride at 32 psi. I was very surprised that they did so well on the road. A little loud, but a plush ride. I have heard the C rated TA / K02's are also super plush and take a beating. Just hard to find in a larger size like I was looking for.
If you spend any time offroad with any weight you will definitely want E rated and an E rated spare. Don't ask me how I know
I wanted to make a few points about P Rated tires and their relatives as many people miss a few things when they talk relative merits.
1. P-Metric (P in front of size designation) are all rated for max capacity at 35 psi. Hard or Euro Metric (Missing that P) are all rated for max capacity at 36 psi.
2. Adding pressure up to the Max Cold Sidewall Pressure does not add capacity rating. It's for special uses like reduced heat build-up at 180 mph and handling (less sidewall flex) requirements.
3. These tires are not rated for continuous Max Load like LT Tires.
4. You must have an extra 10% of Capacity in a Passenger Tire for Truck Use (to make up for the lack of a continuous load rating).
5. LT and Passenger Tire Load Ratings are not comparable. They go through completely different rating tests.
6. Manufactures usually require an extra 25% of capacity for Reserve Capacity of Passenger Tires.
Example:
P275/65R18 116T
2756 lb Passenger Rating
2756 / 1.1 = 2505 lb Truck Rating
2505 / 1.25 = 2004 lb (With 25% Reserve)
.
2004 x 2 = 4008 lb (Max GAWR with these tires)
These tires are not appropriate for trucks with a 4050 RAWR. They are fine for 3850RAWR.
Manufacturers do sometimes deviate from this.
As an example Ford wanted to up the Tow Rating on the 2018 F150. They didn't want to hurt CAFE numbers with LT Tires. They bumped rear axle weight rating on Screw 157 Max Tow to 4050 lb and at the same time fitted it with 20" Tires (To reduce sidewall flex). This reduced reserve to around half the normal amount. But the 25% Rule is the way Ford normally does it.
My '19 HDPP calls for 48psi cold using the oem LT-C. If you do decide to move to an LT tire, you should consider starting in the high 40s and adjusting from there.
My '19 HDPP calls for 48psi cold using the oem LT-C. If you do decide to move to an LT tire, you should consider starting in the high 40s and adjusting from there.
Also keep in mind, the max tire pressure rating on your LT-C tire is 50 psi cold.
For a LT-E rated tire mentioned by the OP, the max tire pressure rating is 80 psi cold.
P tires are not limited to sidewalls at 35psi. My Max tow has P275/65R18 with a sidewall max pressure of 51psi. Door sticker says 35psi, but the sidewall is much higher. You can get an LT load range C that falls between the P tire and the LT-E. Why not try that instead of the E?
My '19 HDPP calls for 48psi cold using the oem LT-C. If you do decide to move to an LT tire, you should consider starting in the high 40s and adjusting from there.
Not saying you're wrong. Just trying to obtain accurate info as I upgraded to LT tires. This is from tire pressure.com. Are you sure about your numbers?
05-26-2020, 12:48 PM
