Narkhelek
New member
I've been running my D rated Duratracs at 36psi. 44psi seems kind of high for anything below E or am I just crazy?
Goodyear Wrangler DuraTrac's
- Thread starter 934x4
- Start date
I've been running my D rated Duratracs at 36psi. 44psi seems kind of high for anything below E or am I just crazy?
I run Michelin D rated LT's. They have a max cold pressure of 65 Lbs. 3 tire shops around my area "at various times" have told me to run them at "about" 45 lbs, so based on that and Seattle Mike's post, I think you need to put in a bit more pressure.
SeattleMike
New member
The load rating refers to how much weight a tire CAN take, but the PSI is based on how much weight you are currently running. Because of the differences in construction, "LT" tires require higher pressures than the equivalent "P" tires. Our 4Runners shipped with "P" (or Passenger) tires and they have the recommended PSI for P tires in the door jamb. There are several threads on this and -JB- has done extensive research into it. I just asked a guy who had the inflation table (industry trade secrets, apparently) and he said 44 is the LT equivalent to the stock tire inflation.
If you need more confirmation that just some jerk in Seattle, there are more links in this post: http://www.toyota-4runner.org/5th-g...flation-nitto-terra-grapplers.html#post732951
Kraeken
New member
You jerks from Seattle think you know everything, with your "grunge" music, and your socks with sandals...
I inflated my tires to 44psi first thing this morning. Thanks!
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SeattleMike
New member
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Kraeken
New member
That's awesome! And disturbing. I like how the girl is putting on a fleece vest over a t-shirt in the background! Nice touch. My wife lived in Tacoma for three years and she does that. We also had a guy try to leave the firehouse one morning after his shift, and he was wearing sandals with socks. We physically prevented him from leaving the building until he chose one or the other...
...anyway, the Duratracs with the proper pressure perform great! The ride is a little better, and the handling is outstanding. I've been driving around NYC today in a constant downpour with five other people crammed in the truck, and they handle like I'm on dry pavement.
...anyway, the Duratracs with the proper pressure perform great! The ride is a little better, and the handling is outstanding. I've been driving around NYC today in a constant downpour with five other people crammed in the truck, and they handle like I'm on dry pavement.
SeattleMike
New member
I still have the stock spare. I make no recommendations on it being good or bad. I was just wary of buying a 5th tire when the first four were relatively unknown.
philsey
New member
Mike, nice man-boobs.
scanny
Senior Member
I'm trying to find all the information I can about C vs E load, proper pressure etc. According this table: http://forum.ih8mud.com/attachment.php?attachmentid=394359&d=1265671558 and toyo one I found on this forum, LT tire pressure should be at minimun 47 psi to match stock P tire 32 psi load rating. It's funny that E tires seem to be a serious overkill but C tires have a little bit less load capacity than stock tires.
After puncturing the sidewall on a factory Dunlop with an innocent-looking ½-inch diameter/18± inch length of sagebrush that was laying in a wheel rut—miles from nowhere—they don't seem like overkill to me.
☆★☆★☆★☆
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StarGazer
New member
Agreed, especially since Duratracs have relatively soft sidewalls. I figured with that fact in addition to the Duratracs being lighter than most of the competition, it made sense to go with load E.
On another note, these tires are fantastic. I've done some trails in 2WD that I had to do in 4WD in another truck that didn't have Duratracs. They just grab and go. And they have excellent grip in heavy (and I mean HEAVY) rain as well. In one particular storm that I was in, almost everyone on the freeway pulled over and put their hazards on. I cruised on by at about 50 mph in 2WD and had great traction. I highly recommend these tires.
CraigRoberts
New member
So is 44 psi "conservative" and 47 would be better all around? Is it true we should go up to 57 for highway driving?
Does this change based on temperature, or should we just check and make sure the tires are at 44 or 47 no matter what the outside temperature is?
Does this change based on temperature, or should we just check and make sure the tires are at 44 or 47 no matter what the outside temperature is?
Kraeken
New member
My tires seem to have a bunch of weight balancing them out.
What I do notice is that when I'm driving at highway speeds, I can feel if the road isn't completely smooth. I originally thought the tires were out of balance, but some roads I feel it and some I don't. They definitely amplify road feel. But I've been up to 80+ on good roads and they're smooth as silk.
What I do notice is that when I'm driving at highway speeds, I can feel if the road isn't completely smooth. I originally thought the tires were out of balance, but some roads I feel it and some I don't. They definitely amplify road feel. But I've been up to 80+ on good roads and they're smooth as silk.
Narkhelek
New member
According to the Discount Tire doc posted above, I should be running my D Duratracs at just under 45psi so it appears that Seattlemike is right on the money at 44psi. That inflation as with all tire inflation numbers is what the tire should be inflated to cold. Meaning, the tires should be inflated to 44psi prior to driving your vehicle any distance. The cold inflation number takes in to account the heating of the tire from driving and the corresponding pressure increase. You do not need to check your tire pressure every few miles and reset it to 44psi.
However, you should check your tire pressure regularly (as in maybe weekly or the morning before starting legs of long distance drives) for best tire longevity. By checking your tire pressure regularly you'll be adjusting the tire pressure for seasonal and geographic changes in environmental temperatures and barometric pressure.
CraigRoberts
New member
Alright, I couldn't get this out of my head.
I finally calculated it "right" based on the Discount Tire PDF.
Just in case it helps anyone else: my 2010 4Runner Limited running E rated tires should be at 42 PSI.
This is exactly 10 PSI over the stock, so just adding 10-15 per the other posts may indeed be much easier. I'm a bit bugged that I just got the tires today at Discount Tire and they only aired them up to 32, even though their own PDF says 42 (or 45 if you round up). I'll have to fill them up tomorrow and see how it affects the ride.
One questions: since this whole PSI thing is based on "cold" does it mean if it's 80F out I shouldn't be setting them to 42?
I finally calculated it "right" based on the Discount Tire PDF.
Just in case it helps anyone else: my 2010 4Runner Limited running E rated tires should be at 42 PSI.
This is exactly 10 PSI over the stock, so just adding 10-15 per the other posts may indeed be much easier. I'm a bit bugged that I just got the tires today at Discount Tire and they only aired them up to 32, even though their own PDF says 42 (or 45 if you round up). I'll have to fill them up tomorrow and see how it affects the ride.
One questions: since this whole PSI thing is based on "cold" does it mean if it's 80F out I shouldn't be setting them to 42?
Narkhelek
New member
Cold doesn't relate in any way to the temperature outside. It just means that the tires haven't been driven and thus heated up from ambient temperature.
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JB.
New member
Not that 3psi is very significant, but the reason it's not 44psi is that the linked chart is not using the de-rated load capacity of the stock standard load (P) tires. When passsenger tires are used on an SUV, their load capacity is officially reduced 10% to help offset the higher loading or rougher treatment they might get than when used on a car. It's a comparison against that de-rated number that produces 44psi for LT265/70/17.
There is a lot there that can be discussed but the simple rule of adding 10-15psi to same size LTs takes care of most everything. There is a lot of load reserve built into the stock tire size so what really matters is making sure not to stray too far away from that.
