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Old 01-29-2014, 01:36 PM   #1
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LT vs P rated tires. Why?

Hello,

I am in the market for new tires for my TV. I have been reading threads indicating that you should always use LT tires on a TV. My question is, if that is the case, why do trucks with ~10K lb towing capacity come with P rated tires from the manufacturer? Yes, I am trying to rationalize buying P rated tires to save some money but also would like to fully understand the factual implications and not necessarily ones opinion of why they feel LT are necessary.

Thank you.
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Old 01-29-2014, 02:38 PM   #2
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The "P" Tire Rating

A tire with a sidewall that contains a "P" is a passenger car tire. Passenger car tires are intended for traditional car-based platforms that carry light loads such as passengers and luggage. Passenger car tires can be found on traditional cars of the sedan, coupe and station wagon variety and may also be used on minivans, car-based SUVs, crossover vehicles and quarter- to half-ton capacity pickup trucks.

The "LT" Tire Rating

The "LT" found on some tire's sidewalls stands for passenger truck. Light truck tires are built with a thicker sidewall and tread that can support heavier loads without stressing the structural integrity of the tire. Light truck tires are used on medium to heavy duty trucks with a half- to one-ton payload capacity and on cargo vans that carry heavier loads than the traditional minivan.

Source: Harry Havemeyer of E How

My take on the why some have P and others have LT:
1. COST.
2. While a P rated tire can hold the weight it is not expected it will need to all the time...
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Old 01-29-2014, 05:01 PM   #3
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you will be replacing the P rated tires twice as often so negating the price savings
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Old 01-29-2014, 06:08 PM   #4
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Quote:
Originally Posted by Eckman View Post
snip...... My question is, if that is the case, why do trucks with ~10K lb towing capacity come with P rated tires from the manufacturer?.....snip
Ride comfort...., and the majority of 1/2 ton trucks never tow anything, especially 10,000lbs.

Bob
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Old 01-29-2014, 07:37 PM   #5
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Thank you for the input. So, I'm convinced it's a better choice but is it a safer choice? I looked at my TT tires today and they say 6 ply C rated. Isn't that similar to the strength of a P rated tire?
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Old 01-29-2014, 08:24 PM   #6
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Quote:
Originally Posted by Eckman View Post
Thank you for the input. So, I'm convinced it's a better choice but is it a safer choice? I looked at my TT tires today and they say 6 ply C rated. Isn't that similar to the strength of a P rated tire?

The tires on your TT are neither P nor LT tires but rather ST tires made for trailers. They have a worse record for failure then P tires on vehicles, and they (ST trailer tires) are nearly all made in China now.
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Old 01-29-2014, 08:44 PM   #7
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What about a P metric tire with a load range of 2756 lbs? They are Falken Rocky Mountain tires. Even de-rated they seem more than enough for what I am asking of the TV.
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Old 01-29-2014, 10:16 PM   #8
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Awesome thread you all answered my question too I'm going LT when I replace my tires on my f150 but is a 10ply too much?
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Old 01-29-2014, 11:16 PM   #9
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snip..... but is a 10ply too much?
Nope, that's normally an "E" load range tire which is the most common in an "LT".
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Old 01-29-2014, 11:43 PM   #10
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What about a P metric tire with a load range of 2756 lbs? They are Falken Rocky Mountain tires. Even de-rated they seem more than enough for what I am asking of the TV.
Load ranges are important when selecting any tire..., but the LT tire offers stronger construction (sidewall, etc.) through the use of different materials, deeper treads, higher PSI capacities, and is more resistant to punctures.

Bob
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