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Old 03-21-2018, 09:23 AM   #1
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50 psi in a load range E tire??

Going to buy tires for the trailer this spring. My trailer came with load range C tires and the factory inflation sticker shows 45 psi. The new Good year Endurance tires that are most poplar are load range E, max inflation 80 psi. There is a smaller Endurance that is load range D, 65 psi.

Not sure I like the idea of under inflating the load range E to 50 or so psi. Am very sure I do not want to run 80 psi.

Am currently running the P 15" Michelin XL tires. They are 4 ply rated.

What to do? Are the Endurance going to have more puncture resistance than the Michelins? Are they going to run hot if inflated to 50 or so PSI?

Is anybody running the D rated Endurance?
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Old 03-21-2018, 09:58 AM   #2
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I run E carlise as endurance came out shortly after I pur. carlise but I run them at 65 psi. 80 is for heavier loads. My 2500 silverado has E tires and unless towing or loads run 60psi rear 55psi front, have did this way for yrs. IMO would pur. E rated run at 65psi.
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Old 03-21-2018, 09:59 AM   #3
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Definitely do not run under inflated that much. Sidewalls will be way to soft.
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Old 03-21-2018, 10:08 AM   #4
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Quote:
Originally Posted by Bill M. View Post
Is anybody running the D rated Endurance?
Pretty sure the D rated Endurance are not available in 15". Besides a D rated tire is only good for 65 mph.

Most folks with the E rated Endurance are running between 60 and 80 psi. Don't ask me to give a definitive answer, because there isn't one.
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Old 03-21-2018, 10:11 AM   #5
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IMO, you should inflate your TT tires to max cold. If the endurance are rated at 80PSI cold that's where you should run them. Lower inflation will result in sidewall flexing under load, especially as the tire heats up, and potential failure. My2c
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Old 03-21-2018, 10:53 AM   #6
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I have had several Goodyear blowouts and I hate those tires!!!!
I like the Mich. just fine, but the 10 Ply Carlisle are the best you can get!
Throw away your goodyears.
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Old 03-21-2018, 12:12 PM   #7
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"E" rated tires

My tow vehicle is a 2013 Ford E150 Xlt Premium van factory equipped with "E" rated Michelin Defender tires. The inflation sticker in the door jamb indicates 55 PSI Front and 80 PSI rear. Front axle is rated for 3700LB. Rear axle is rated for 5700LB. GVW is rated at 8600LB. I run 50 PSI in front tires and 70 PSI in rear tires, towing or not towing. I have weighed both not towing and loaded up plus 23D airstream. All within limits. You should have no problem running 50 or 55 PSI in your "E" rated tire. Keep in mind that the MAX COLD PSI of 80LBS is needed to support the MAX weight rating listed on sidewall. Lower pressure means less weight on tire. Just MHO. (I have 1.5+ million miles driving Class 8 trucks all over the country, so I am very careful with my tire inflation and check them often.)
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Old 03-21-2018, 12:21 PM   #8
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Quote:
Originally Posted by vintagemotor View Post
I have had several Goodyear blowouts and I hate those tires!!!!
I like the Mich. just fine, but the 10 Ply Carlisle are the best you can get!
Throw away your goodyears.
I agree about carlisles being very good as I have been running them for yrs. D rated now that they have E [10 ply rating] I have them and run at 65psi and never get hot and normal wear. At every stop I feel tread old habit of thumping tires if losing air and hubs for heat, and never felt any heat running 65psi. Plus I tow at 70 to 75 mph. I also have full fresh water leaving and do not dump until getting home for 4 day trips so wt. is a little heavy but with in limits of AS ratings I think?
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Old 03-21-2018, 01:31 PM   #9
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Manufacturer's usually have a table of psi vs rated weight.

If this is for the 32', I have a 33' and am running Load E's at 80 psi.

If this is for the 25', I would definitely step up to higher than Class C as you will feel the improvement in how the trailer rolls from the higher psi. Just check to see if the manufacturer supports lower pressure than max cold rating. If the decision is to go with the Load E's, the 25' is possibly a little light for 80 psi, so your call on whether to air-up that high. Also, as already noted, check to see if there are further speed restrictions from a psi lower than max cold.

While not an exact comparison, it is common for light trucks to specify Load E's and then call for the front tires to inflate to ~50 as uraljohn points out. Ok, sure, one is a ST tire and the other is a LT which goes back to the point about checking with the manufacturer's table
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Old 03-21-2018, 06:28 PM   #10
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Quote:
Originally Posted by uraljohn View Post
My tow vehicle is a 2013 Ford E150 Xlt Premium van factory equipped with "E" rated Michelin Defender tires. The inflation sticker in the door jamb indicates 55 PSI Front and 80 PSI rear. Front axle is rated for 3700LB. Rear axle is rated for 5700LB. GVW is rated at 8600LB. I run 50 PSI in front tires and 70 PSI in rear tires, towing or not towing. I have weighed both not towing and loaded up plus 23D airstream. All within limits. You should have no problem running 50 or 55 PSI in your "E" rated tire. Keep in mind that the MAX COLD PSI of 80LBS is needed to support the MAX weight rating listed on sidewall. Lower pressure means less weight on tire. Just MHO. (I have 1.5+ million miles driving Class 8 trucks all over the country, so I am very careful with my tire inflation and check them often.)
I forgot to add that I run the Goodyear Endurance 15" tires that came on my 2017 23D at 70 PSI. My 23D loaded with all our stuff ready to travel weighs right at 5400LBS. Each tire is only carrying approx. 1350LBS. No need to run the MAX COLD PSI of 80 when so lightly loaded. Makes for slightly better ride for the Airstream and no shift of cargo. We travel pretty light in the trailer since our van has a cargo capacity rating of just over 2500LBS.
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Old 03-22-2018, 09:09 AM   #11
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What is wrong with your michelins? Put new ones on....
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Old 03-22-2018, 09:50 AM   #12
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I replaced 4 year old Goodyear Marathons May 2017 with the "new" Goodyear Endurance. Since that time have put almost 20,000 miles on the trailer including one 13,000 3 month road trip coast to coast. I kept them cold inflated at 75-80 psi. Towed mostly 60-65 mph. These tires have worn exceptionally well. Never lost pressure. I spent a lot of time considering Michelin "truck" load range E tires or the GY ST (trailer) Endurance. When I called Jackson Center the tech absolutely recommended the Endurance tire. Very pleased I made that decision.
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Old 03-22-2018, 10:27 AM   #13
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I run E rated Michelins. Inflate to 65 psi cold. When they warm up the pressure will increase to about 70 psi. This will allow a slightly softer ride, your cornflakes will stay on the shelf.
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Old 03-22-2018, 10:36 AM   #14
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I don't like Goodyear...tires... had my fill of their failures as well as their service... I went to mitch years ago and now that is about all I have been run'n for years... will stick with them till something else comes along...

As to tire size... if I were you.. I'd make the jump to 16 inch rims and tires.. much more common for the weight and indeed load range max...

As to tire pressure... most seem to go with a higher pressure... airstream trailers need soft rides.. else your going to be having strange problems...

That being said.. I go with the weight vs tire pressure as the manufacture requires...
A lot of people think that it effects the sidewall... breakdown.. and so want to pump 'em up... hard... but, so long as they are not getting hot in the sidewall.. let 'em flex... and save the trailer...
Another thing that a lot of them don't seem to understand is that when you blow 'em up hard... you can and will get higher tire wear... as the dual's will scrub .. where as if the tire is softer.. it will flex... and not leave its rubber on the road... so we have found...

Each to their own... but I only run 45 lbs of air in mine and they are the mitch 16 inch...which are the same as what is on the PU... and they seem to do quite well on my trailer... I use the tire pressure chart for the tire and load... and it seems to be right on... for the life of the tire... of which most of the time you will replace 'em due to age than wear 'em out... Keeping the sun off of 'em does extend the life also...

Good luck..
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