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Old 10-24-2017, 10:09 AM   #15
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When you say a "marked improvement" what characteristics to the ride changed?
When I had the P rated tires on the truck it felt a little squirrely side to side sometimes. Like I said in my original post for the first 50 miles it almost felt worse but then became a lot better afterwards. By the way I'm towing a 34' trailer at around 7400# on average.
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Old 11-09-2017, 09:03 AM   #16
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so last weekend I took the advice of one of the posters here and put more air in the tires of my gmc sierra tow vehicle before a trip from dfw to wright patman lake near texarkana. the tires are marked as 51# max so instead of the usual 34# I keep them at when not towing, I went with 42# in the front and 46# in the rears. it did seem to take out a lot of the shimmy..FYI
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Old 11-09-2017, 08:02 PM   #17
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P metric tires max pressure may go to 35/44/51 psi but max load stops at 35 psi. The higher psi just stiffens the sidewall with no load gained. This makes the tire placard pressure recommendations worthless for using on a LT tire.
Using a LT tire requires about 50 psi for the tire to have the same load capacity as the P tire @35 psi....this per CapriRacer and Tireman9 ....our resident tire engineers.

Check out a LT load pressure chart.
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Old 11-09-2017, 09:50 PM   #18
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If the truck is rated for its payload using P metric tires, I don't see any reason not to use them. They are cheaper, lighter, and ride better.

If it makes you feel better, feel free to get some LTs.... they are more expensive, heavier, and ride worse. Also tougher and can handle more load....but that doesn't really matter if your towing within your vehicle specs...which call for P-metrics.
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Old 11-10-2017, 07:04 AM   #19
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I went with 42# in the front and 46# in the rears. it did seem to take out a lot of the shimmy..FYI
Where I come from, "shimmy" is a balance or tire problem.

The stiffer LT tires will give a firmer and more crisp feel than P tires.
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Old 11-10-2017, 07:46 AM   #20
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no shimmy when not towing. more air in the tires made sidewall a little stiffer not to carry more load. made an improvement in overall ride. may eventually try LT tires but will do this when I tow for now.
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Old 11-11-2017, 10:08 PM   #21
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no shimmy when not towing. more air in the tires made sidewall a little stiffer not to carry more load. made an improvement in overall ride. may eventually try LT tires but will do this when I tow for now.
When time comes to replace those tires check out a 51 psi P rated tire.
The LT C load range tire has a 50 psi.
I bought 4 OEM GM chrome wheels and had 4 Goodyear Duratrac P265/70-17 tires mounted for winter use and using on muddy worksites and muddy pastures. Their a quiet mud terrain type tread but they did give a stiff ride when empty. Dropped the pressure back to 32 psi in the rears and all is well.
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Old 11-12-2017, 08:45 AM   #22
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well the P tires on my truck are rated for a max of 51#. I doubt I would ever want to fill them to that but with 42-46 they seem to give a better ride when pulling my 246RKS.
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Old 11-12-2017, 12:32 PM   #23
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I changed from P to LT on my 2004 F150 and if there was a ride difference, I couldn't notice it. And, you don't need to run E-rated tires at their max rated PSI all the time, either.
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Old 11-12-2017, 12:42 PM   #24
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Lots of F-150's come standard with LT tires. Actually my Honda Ridgeline came with LT tires. I am puzzled as to why any truck would not come with LT tires.

Before this thread I was ingnorant of that fact not all trucks have LT tires. After all LT means Light Truck.
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Old 11-13-2017, 01:25 PM   #25
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I don't know if there is a difference in ride, but I don't know anyone that runs P tires on their pickup. Maybe on an El Camino
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Old 11-13-2017, 10:02 PM   #26
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I don't know if there is a difference in ride, but I don't know anyone that runs P tires on their pickup. Maybe on an El Camino
You sure don't know many folks
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Old 11-14-2017, 06:53 AM   #27
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yes they pretty much all come with P tires now. before this year the last new truck I bought was a new '07 avalanche and even it came with P tires..I had it for 10 years and somewhere along the way I changed them out to LT all terrain tires but my new Sierra came with P 275/55R20'S
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Old 11-14-2017, 12:11 PM   #28
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yeah my 2013 Ram rated for 10,300lb towing and 1500lb payload per call to manufacturer came with P275/60R20 inflated to 40psi. i was wondering if i needed LT tires but with the comments i should just stick to the P.
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