2009 - 2014 F-150

45-50 psi on LT "E rated" tires?

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  #16  
Old 11-01-2011, 02:17 PM
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Post up some pictures afterwards, I might drop back to 265/70/18's Firestone AT's for my next set of tires, I think they are the same 32.7" that you are look at? I like the look of my 275/70/18 but I do notice the extra weigh a bit and I don't really need the E rating.
 
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Old 11-01-2011, 03:38 PM
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Will Do: If they look as good as canadianelbow truck in first pic I will be happy...

Second picture is awesome also but I do not need or want that big of a tire on this truck.

The 275/70/18 does look good so hopefully these will be close.

This guy has a 2wd with 265/70/18's.

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Old 11-01-2011, 06:08 PM
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LT C load range will ride the best out of all the LTs. E always seem to beat the crap out me. I went with 275/65/18 LT Load range C Goodyear AT/S on mine. It rides smoother now with 18" LTc's then the P20"s that came on the truck.

My understanding is the C= 6 ply rating D= 8 ply rating and E= 10 ply rating
and Pmetric is a 4 ply rated tire.
 
  #19  
Old 11-01-2011, 10:14 PM
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Originally Posted by kschex
If I run 45-50 psi on LT "E" tires will they still be alot rougher riding than P rated stock tires? I had LT "E" terra grapplers on my old truck and they beat me to death. I think I was running higher psi but I am not sure to be honest. I am so confused if I want to to go with Cooper AT3 P265/70/18(32.6") @ 43lbs each or LT275/70/18(33.10") # 56lbs each with my 2" leveling kit..

My Truck:
2011 SCREW 4x4
5.0
3.55 Gears
You can drop the pressure to 40 or 42 psi and get a smoother ride. My Terragrapplers ride great at 42 psi.
 
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Old 11-02-2011, 12:12 AM
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I agree. If you are not loading it with a bed full of stuff or a heavy trailer, then there is no reason to run 45 psi in these tires. I run 35 psi on my truck all the time, and have no issues. If I load it, I air the back tires up to carry it.

You should be able to run the E rated tires down that low and get a reasonable ride out of it. I had Michelin E rated tires on my last pickup and I ran them at 30 in the rear and 35 in the front empty, and those tires had 80K on them when I traded it.
 
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Old 11-02-2011, 12:19 AM
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Originally Posted by GlennRMK
What was your wheel weight?

What does the stock wheel and tire weigh?

I ordered the same size tires as you and some rims and I'm interested to see the weight comparo.

I think the BFGs weigh 57 lbs? Stock SR-A Goodyears weigh 39 lbs?

I just can't deal with a highway tire.

Also, I just sold my 03 Cummins and only ran 48-50 lbs in the front and 42 lbs in the rear with E rated 35s.

I was thinking like 35 psi in the BFGs on my new FX4 F150.

I didn't weigh the wheel separately and to be honest I don't recall what one was versus the other. But the new set up was only a few pounds heavier both 80 something pounds.

Sorry I can't be any more help. I will have the new wheels and tires off the truck in a few weeks and will weigh them then. Unfortunately I have sold the original set up so I can't weigh them.

Rob
 
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Old 11-02-2011, 12:21 AM
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I ran 35 PSI in my E rated Toyo MTs and they wore perfectly and rode even smoother than stock. If your not putting them on a heavy duty pickup (which no half ton is) stick with what the sticker on your door says.
 
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Old 11-02-2011, 10:23 AM
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I just put 285/65/18 BFG All Terrains on my 09. I called BFG and their tech told me to inflate the tires to 54lbs. Rides pretty rough, but I figure they should know what they are talking about......
 
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Old 11-02-2011, 10:45 AM
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I run 30-35 in my truck and it rides a lot better than when I have 40+ in them.

the wear fine that way too.
 
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Old 11-02-2011, 11:14 AM
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Originally Posted by brazzeal15
I ran 35 PSI in my E rated Toyo MTs and they wore perfectly and rode even smoother than stock. If your not putting them on a heavy duty pickup (which no half ton is) stick with what the sticker on your door says.
And if your vehicle came with a LR E it would state 50 psi, my LR C are 45, and the only tires with a recommended pressure of 35 are P series. And that only because you get no more load carrying ability at pressures above 35 on a p series.35 on a LR E is dangerous. Most LR E tires have a weight rating of 3200 to 3600lbs. At 35, you are well below half that rating which doubled up does not come close to the GAWR of your truck.
The minimum that should ever be in a LR E (not including those that have a weight rating of 4000+) would be 45. The 4000+ LR E could be okay for normal everyday unloaded driving at 40.
The construction of these tires require a higher pressure for support. Low pressure cause heat which will cause tire failure.
The federal mandates for the TPMS systems state that with a LR E tire, the sensor should put out a waring at 46psi.

LT tires do give a rougher ride, no doubt, but only because they require higher pressure and are built far sturdier. If you do not want the rougher ride, get a P series tire.

YellowFX4, you could drop them to 50 with no problem, but as I stated, do not go below 45 unloaded.
 
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  #26  
Old 11-02-2011, 11:45 AM
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I am running D rated Kelly TSRs on my Expedition. I used teh max laod ratings on teh side wall versus the vehicle axle weights, and came up with 36 front 42 rear. I also contacted Kelly, and spoke to a apllications engineer, and he agreed with those numbers. So far 25000 miles and tire look great, no adverse wear patterns. At this rate I should easily get 50000 out of them.
 
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Old 11-02-2011, 12:35 PM
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I run 40 psi in my 10 ply's.
 
  #28  
Old 11-02-2011, 12:40 PM
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Originally Posted by kingfish51
And if your vehicle came with a LR E it would state 50 psi, my LR C are 45, and the only tires with a recommended pressure of 35 are P series. And that only because you get no more load carrying ability at pressures above 35 on a p series.35 on a LR E is dangerous. Most LR E tires have a weight rating of 3200 to 3600lbs. At 35, you are well below half that rating which doubled up does not come close to the GAWR of your truck.
The minimum that should ever be in a LR E (not including those that have a weight rating of 4000+) would be 45. The 4000+ LR E could be okay for normal everyday unloaded driving at 40.
The construction of these tires require a higher pressure for support. Low pressure cause heat which will cause tire failure.
The federal mandates for the TPMS systems state that with a LR E tire, the sensor should put out a waring at 46psi.

LT tires do give a rougher ride, no doubt, but only because they require higher pressure and are built far sturdier. If you do not want the rougher ride, get a P series tire.

YellowFX4, you could drop them to 50 with no problem, but as I stated, do not go below 45 unloaded.
This is not the first I have heard of this. I am by no means any kind of tire expert, but when looking for which tires to stick under my truck I spent some time in the Tire section here. I recall one thread in particular where Marshall said he was running a 30-something pressure and it ran fine, when he got slammed, and beaten for such an atrocity.

If you want a better understanding of the what and why of tire pressure, try pm'ing Wandell in the tire section. The guy is quite knowledgeable, and can easily point you to different threads about this topic. Or, you could just head to the tire section, and search for yourself. I run 45psi in my LT 295/70/18 Nitto Trail Grappler's, despite what the door jamb sticker says. That said, my winters are a P285/70/17, and I run the sticker recommended 35 psi in those.
 
  #29  
Old 11-02-2011, 01:56 PM
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If your towing, bump that pressure up to 50. If not leave it at factory. I don't think any half ton NEEDS an E rated tire simply because you shouldn't tow Or haul that much anyways. But the problem is most tire sizes that people want are either D or E rated so people think they need to max our what the tire says.
 
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Old 11-04-2011, 01:47 PM
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Well I am going to pick up the truck in a few hours hope it turned out good...
 


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