mikemontauk Posted April 7, 2014 Report Share Posted April 7, 2014 Gents, Picked up a '10 Wrangler 4dr. Rigged it up for the beach. Tires on it are E rated, and have pressure up to 60#'s. I have owned several jeeps, but with D rated tires. With the D tires, I keep about 28-30#'s in tires and have no problems on beach, and knocking around Town I have been told with E rated tires, that you cannot drive that far with lower pressure or you will ruin tire quickly. I have heavy duty compressor at home. Here's my question: If I air down to 28-30 pounds of pressure on my new E rated tires. Will I be able to run back home15-20 miles on that pressure? Example: hop on beach in Montauk, run out to Georgica. head back to Montauk on road. Thanks, Mike Link to comment Share on other sites More sharing options...
d00nspoon Posted April 7, 2014 Report Share Posted April 7, 2014 You wont have a problem... I wouldnt run 60psi even though theyre rated for 80psi in a wrangler you'll have a better ride if you run them at about 40 Link to comment Share on other sites More sharing options...
conifers4 Posted April 7, 2014 Report Share Posted April 7, 2014 what pressure are you driving with on the street? Link to comment Share on other sites More sharing options...
LouC Posted April 7, 2014 Report Share Posted April 7, 2014 There is a lot of mis-information out there on proper tire pressure for vehicles that have been modified with tires that are not standard size/load. An E rated tire is far beyond what a Wrangler really needs (some are rated at 3,000 pressure and more but at 80 psi) and because of their heavier construction, they need higher tire pressures to keep the tire from flexing and overheating. The Wrangler Rubicon for that year, came with a 255/75-17 Load range C tire on it. There is really no need to go bigger and heavier for the beach, but since you asked, I'd say you need to run at least half the max tire pressure since you are probably putting half the weight on it that it was designed to carry at full psi. So more like at least 40-50. You can pick up an IR temperature measuring gun from Radio Shack and measure the tread temps after driving it at highway speeds. If you are between 100-125 or so, thats OK but higher than that you might need more air pressure. A Wrangler only weighs about 4500 lbs and E rated tires are for pick ups that max out at 6000 lbs or so.... Post up what size they actually are. Bridgestone/Firestone published a document, that tells you based on the stock tire size, what you need to run the bigger tires at so they will not be under inflated. 2007 Jeep Grand Cherokee Limited 5.7 Quadradrive II 1998 Jeep Grand Cherokee Laredo 4.0 Selectrac 1988 Four Winns 200 Horizon 4.3 OMC Cobra Link to comment Share on other sites More sharing options...
riarcher Posted April 8, 2014 Report Share Posted April 8, 2014 Done this simple procedure and done it for years with all sorts of vehicle / tire combos for many reasons. It's just old school stuff that's somehow been left behind. Â For street running.... Take the new tires to a clean asphalt lot or road,,, white chalk across the tread (front & rear). Adjust air to have the chalk wear (rub) off evenly from side to side when driven short (20 / 50 ft.) on the asphalt. Â When the chalk comes off evenly, you'll get even tread wear at low speeds. To adjust for hi-way I let out another 4-5 percent to compensate for inertia and heat when running. Â Try it. You'll be surprised how well it really works. One may think the sidewalls would make steering a bit "iffy",, but it doesn't. This gives a decent ride,, good tread mileage,, and better traction when needed. Â Warning,, it may seem scary at first. My Wrangler ran 33's. If I remember right It liked 12 pounds in the rear and 16 up front.. No they did not look flat or handle poorly,, simply compensated for the strength of the casing as related to vehicle weight. Â Never needed to air down for the beach,, but for rock crawling I'd go 8# front & 6# rear with a load in back. Never popped a rim or had any issues at all. Â Really simple, old school methods that still work well today. Just my $0.02 for what it's worth. Link to comment Share on other sites More sharing options...
Minero Posted April 17, 2014 Report Share Posted April 17, 2014 What Mike is saying is right! But like you say if you air down, well it depends how low it is. Say if you went down to 18 to 15 psi, you should not have a problem crusing at 40mph, but if you want to go 75 i would defenitly go to at least 32 For that jeep I would be arond 34 to 36lbs, as those tires are for load, and doing highways at 75 they need to cool down and if you go lower you could build some heat as it has thicker and more plys if you are lower than say 32 in summer you might heat them too much. But in winter I think you can go down to 28 and be ok, as long as you dont go over say 65 in 32 you would be ok at 75. just use common sense, the lower the tire pressure, the more heat you produce as it has more contact with the asphalt, and it bends more creating internal friction. With more air in them, the tire will run cooler. Right now I have a 4 door Toyota Hilux, and are running 26 to 28lbs because winter started, but in summer, I would be running 32 to 34 Hope this helps Saludos Adrian Link to comment Share on other sites More sharing options...
garrr Posted April 17, 2014 Report Share Posted April 17, 2014 Half of whatever the standard PSI is where you want to be on the beach, If it is really soft drop it another 5 psi. I don't know where you are getting those crazy high PSI (60PSi in a wrangler?) Numbers from, My Brothers Stock 2013 Rubicon 4 door says 37PSI on the door jam; He runs about 20PSi off-road with no issues. Link to comment Share on other sites More sharing options...
Minero Posted April 17, 2014 Report Share Posted April 17, 2014 I guess he looked at the ratings in that appear in the tire. Saludos Link to comment Share on other sites More sharing options...
d00nspoon Posted April 18, 2014 Report Share Posted April 18, 2014 E rated tires dont need to run at anywhere near 80psi especially with a light vehicle like a wrangler.... Look at the weight ratings for running at 80 psi and use percentages... 40 psi on the street for a wrangler is all youneed regardless the rating... The weight of the vehicle wont weigh down the jeep enough to cause too high temps in the rubber with a jeep Link to comment Share on other sites More sharing options...
HatterasJack Posted April 18, 2014 Report Share Posted April 18, 2014 Half of whatever the standard PSI is where you want to be on the beach, If it is really soft drop it another 5 psi. I don't know where you are getting those crazy high PSI (60PSi in a wrangler?) Numbers from, My Brothers Stock 2013 Rubicon 4 door says 37PSI on the door jam; He runs about 20PSi off-road with no issues.   E rated tires dont need to run at anywhere near 80psi especially with a light vehicle like a wrangler.... Look at the weight ratings for running at 80 psi and use percentages... 40 psi on the street for a wrangler is all youneed regardless the rating... The weight of the vehicle wont weigh down the jeep enough to cause too high temps in the rubber with a jeep   As I posted in another tire thread here ... I just had E rated tires mounted on my Wrangler and the shop guys told me to stay with what the set the tires to - 40 PSI  IF I thought the ride was a bit harsh/hard, they said take it down to 35 PSI  I think the ride's great at 40 "Gradatim Ferociter / Carpe Diem / No Guts, No Glory  "I hate taxes, and Communism, and inflation. Now, get to work, and remember that the person who makes decisions around here is ME." Ronald Reagan Link to comment Share on other sites More sharing options...
HatterasJack Posted April 18, 2014 Report Share Posted April 18, 2014  Right now I have a 4 door Toyota Hilux, and are running 26 to 28lbs because winter started  Adrian   Adrian, where are you located ? "Gradatim Ferociter / Carpe Diem / No Guts, No Glory  "I hate taxes, and Communism, and inflation. Now, get to work, and remember that the person who makes decisions around here is ME." Ronald Reagan Link to comment Share on other sites More sharing options...
Minero Posted April 18, 2014 Report Share Posted April 18, 2014 I am from Mexico, but are working in Argentina in the south at the Patagonia. If you go to google earth, google Lago Buenos Aires, right at the Border with Chile in a town called Los Antiguos. Its heaven right now for me, as I had never had such opportunities to fish every weekend, I have the Lake and two Rivers, Los Antiguos and the Jenimeni, right now the Brown trout run is just starting to go into the Rivers, so they are strong fighters comming from the sea. And I guess you asked because I mentioned we are starting winter, and yep its autum right now but we already had the first snow.  Saludos Adrian Link to comment Share on other sites More sharing options...
Phil Allen Posted April 19, 2014 Report Share Posted April 19, 2014 Just took a set of E rated michelin's off my F-150, had 54,000 miles on them and still had 6/32's tread in the centers. Outer edges were worn a little more. I ran them at 37lbs on the street and 15 to 20 on the sand depending on conditions. I air down when I get to AI or the OBX and will run like that the whole time I'm there, sometimes up to 60mph for 10-20 miles. Might I have gotten another 10,000 miles if I aired up coming off the sand each time? Sure, but I'll trade a few miles for the convenience. Plus, taking them down to 15 or 20 on the sand lets me take it out of 4x4 when I'm running in the ruts, saves strain on my truck and maybe even a little fuel. Just have to remember to put her back in 4x4 when pulling out of the ruts. There have been rainy weekends on AI that I didn't use 4x4 at all, wet packed sand be just like the hard road. Â And also. Those Michelin's I just took off were the 275/75/18 LTX AT2's. I dropped another $1000 and put the same ones back on. Things ride great, ride super great when loaded or towing something heavy, snow and mud they are respectable, and they're QUIET. Â Plus, my 4' 11" wife loves to hop up into her lifted, big tired truck when she's leaving her elementary school speech therapist job. She says it makes all the other teachers think she's the crazy redneck but it's really the goofball she's married to. My daddy was a pistol, I'm a son of a gun!(*member formerly known as 'PinMd)' Link to comment Share on other sites More sharing options...
garrr Posted April 19, 2014 Report Share Posted April 19, 2014 Just took a set of E rated michelin's off my F-150, had 54,000 miles on them and still had 6/32's tread in the centers. Outer edges were worn a little more. I ran them at 37lbs on the street and 15 to 20 on the sand depending on conditions. I air down when I get to AI or the OBX and will run like that the whole time I'm there, sometimes up to 60mph for 10-20 miles. Might I have gotten another 10,000 miles if I aired up coming off the sand each time? Sure, but I'll trade a few miles for the convenience. Plus, taking them down to 15 or 20 on the sand lets me take it out of 4x4 when I'm running in the ruts, saves strain on my truck and maybe even a little fuel. Just have to remember to put her back in 4x4 when pulling out of the ruts. There have been rainy weekends on AI that I didn't use 4x4 at all, wet packed sand be just like the hard road. And also. Those Michelin's I just took off were the 275/75/18 LTX AT2's. I dropped another $1000 and put the same ones back on. Things ride great, ride super great when loaded or towing something heavy, snow and mud they are respectable, and they're QUIET.  Plus, my 4' 11" wife loves to hop up into her lifted, big tired truck when she's leaving her elementary school speech therapist job. She says it makes all the other teachers think she's the crazy redneck but it's really the goofball she's married to.  Michelin LTX AT2's are Great Tires. Good choice! Link to comment Share on other sites More sharing options...
mikemontauk Posted April 23, 2014 Author Report Share Posted April 23, 2014 Thanks guys. The tires are Fun Country LT315/75R16 with a max psi of 65#.Update. Took tires to 35 pounds and ran them to the softest beach we have out here. Loaded car with gear and kids. 35 ran well. 30 pounds ran better (that validates the 1/2 of suggested rating theory). Spent the weekend knocking around Montauk town with 35 pounds. While the gas mileage suffered, there wasn't any negative effects. Put 50#'s back in and have a much softer ride. I'll try down to 40 and see how the street ride goes. Mike Link to comment Share on other sites More sharing options...
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