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gmyeah

LT vs P metric tires

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I understand the differences when comparing a passenger (P metric) tire vs a light truck (lt) tire, but still had some questions. I have a 08 sierra 4x4 z71 1500. I'm considering going to the Firestone Destination AT tire (but the LT version, C load rating). I figure the C is a good compromise with not going to nuts and really impacting my ride and gas mileage like a E would. Even though you can run these at a lower pressure than their stated max when not carrying a load...I think you can run them at 35psi, what is a good no-load air pressure to run to get maximum life / treadwear out of the tires? I understand with P tires what you gain and loose with increasing and decreasing the air pressure, but the range is smaller. With LT tires you might find yourself running 80psi if you have a load and your tires are E rated. So, for arguments sake......say no load, C load rating, maximum life. What would you do?

The ratings on these tires seem great but I'm not sure they are with the LT's or P. Thanks for the help in advance.

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I would run 35-40. Go by the door tag. Engineers know best right? lol :crackup:

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Just stay with the LT load C tire run them at the recommended pressure. The load E is a waste of money unless you have a 3/4 ton which your post stated 1500.

 

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Yeah, the C range tires are what you need for a 1500. The only reason I would concider running a higher load rating is because that is the only rating available in your desired tire. Right now Im running load range D tires, but only because thats the only range a 35x12.50/17LT BFG KM2 come in. I had C rated 265s and they handled everything I loaded into the truck just fine. I kept the pressure around 40 PSI.

 

As far as the P rated tire goes, Ide never put one on a pickup. I wouldnt even run them on my S10. I stayed with the C rated LT tires.

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All good info. Thanks. One follow up though. Would you actually get more treadwear out of you LT tires if you ran them at 50 vs 40. I know you'd sacrifice ride and gain more load capability. The P rated come with a 50K warranty the Lt does not. I just want to make sure I get 50K on these tires. My last set of Dueller AT TRevo2 were brutal for the # of miles on got on them.

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I would run 35-40. Go by the door tag. Engineers know best right? lol :crackup:

 

 

The door tag referrs to P tires..........I'm talking about LT's. :crackup:

 

Only other question is what pressure should I run to achieve the same load carrying capacity as the std P tires I have on it now. Can someone refer me to the tables that everyone refers to. Thanks!

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i,ve run the Firestone Destinations on both my sburban and my 1500,,,,great ride,,decent traction,,,,but very poor longevity on both trucks,,,,barely better then 26k miles befor tread was minimaly legal, I put the Bridgestone Dueler 695,s on the suburban 60 k ago and they,re still going strong and the 1500 is sporting new dueler revo II,s.....new this month,,,so we,lle see how they last.

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i,ve run the Firestone Destinations on both my sburban and my 1500,,,,great ride,,decent traction,,,,but very poor longevity on both trucks,,,,barely better then 26k miles befor tread was minimaly legal, I put the Bridgestone Dueler 695,s on the suburban 60 k ago and they,re still going strong and the 1500 is sporting new dueler revo II,s.....new this month,,,so we,lle see how they last.

 

 

Wow, that's interesting. Maybe it's what we do with our trucks. I had two sets of Revos on SUVs and in both cases I almost hit 60K miles. So I was psyched to put them on my 1500 (even though they get bad treadwear marks on tirerack) and I'll be lucky to hit 30K miles. I don't normally hear anything bad about the Destination At tire. Did you have P or Lt?

Edited by gmyeah
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Back when I was working at a Firestone store we had a chart for each tire that gave the load to air pressure. For example, this chart would say at 40psi the tire would carry 2200lbs, 45 psi would carry 2400lbs and so on. Each tire had a chart for each size available in that particular tire. I don't know if they still do that.

Back then you could also get some tires that were labeled XL for extra load. These were P tires, but with 6ply. Again, not sure it is even an option anymore.

 

I don't know why people call "P" tires "P metric", the only true "metric" tire was the Michelin TRX tires used back in mid 70's to mid 80's. Current tire sizes are a mix of metric and standard measurements.

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All good info. Thanks. One follow up though. Would you actually get more treadwear out of you LT tires if you ran them at 50 vs 40. I know you'd sacrifice ride and gain more load capability. The P rated come with a 50K warranty the Lt does not. I just want to make sure I get 50K on these tires. My last set of Dueller AT TRevo2 were brutal for the # of miles on got on them.

 

 

 

You wont get any more wear out of the tire running higher pressure. In fact, you will probably get an uneven wear pattern that will cause the center to slick off before the shoulders, so you will actually get fewer miles out of the tire before having to replace it.

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I had 2 sets of Revo's that were C's on my 99 and have no complaints. The tires plus the Bilstein shocks improved the ride dramatically.

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OK so answer me this. I have the Cooper Discoverer HT 275/55R20XL. I know the XL is extra load. Where is that in comparison to a P metric or a LT. There are no letters in front of the numbers.

 

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LT rated tires will have a C, D, or E after the size (ex. 285/75/16E = 10 ply rating). I would say that its a P rated tire with a stiffer side wall. Thats just my guess though.

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I believe Stevens11 has the same tires on his NHT just a different size.

 

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I have Yokohama geolanders(275/65-18) in a C load on my truck right now. I run 40 in the front and 38 in the rear.

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