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Old 06-05-2015, 02:57 PM   #11
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Running the tires at max pressure can be good for many but if load is light you can actually reduce your contact patch of tire to the road. Rolling residents is good and load capacity good but it wears in the center and reduces the ability to stop. Less contact means longer stopping distance. Check wear pattern and see if you are wearing even or in the center.
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Old 06-05-2015, 02:58 PM   #12
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Have a Crusader 290RLT and want to upgrade the Tires--looking at the Carlisle ST225/75R15 they have 2 model --1 is LRD-8P # 5151401 to be inflated to 65 LBS--the other is LRE -10P#5151411 to be inflted to 80 LBS-- Both tires are for a 15 inch rim--if I choose the LRE I have to inflate to 80 LBS will my rim take it--today took 1 wheel off and nowhere do they state PSI rating --only the MAX load 2830LBS--since there is not much difference in pricing but want to be safer with a 10p instead of the
8p--can anyone tell me if the rim is strong enough for 80PSI--Thanks
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Old 06-05-2015, 03:16 PM   #13
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Originally Posted by Claude002 View Post
Have a Crusader 290RLT and want to upgrade the Tires--looking at the Carlisle ST225/75R15 they have 2 model --1 is LRD-8P # 5151401 to be inflated to 65 LBS--the other is LRE -10P#5151411 to be inflted to 80 LBS-- Both tires are for a 15 inch rim--if I choose the LRE I have to inflate to 80 LBS will my rim take it--today took 1 wheel off and nowhere do they state PSI rating --only the MAX load 2830LBS--since there is not much difference in pricing but want to be safer with a 10p instead of the
8p--can anyone tell me if the rim is strong enough for 80PSI--Thanks
The rim manufacturer is probably the only one that can tell you what it is rated for, but

If the load capacity of the LR E tire at 65 psi is equal to or greater than the load capacity of the current tire (and of course if the trailer isn't over-loaded) then that is your other option - run the LR E at 65psi. This debate comes up all the time, and I've never seen anything near a consensus on what pressure to run when you change the tire to higher load rated tire - whether its on the tv or the tt. The vehicle manufacturer's sticker is based only on the OEM tire, and the max tire rating is based only on the max load capacity of the tire. You end up in no-man's land when you upgrade from the original load rating.
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Old 06-05-2015, 03:25 PM   #14
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Your explanation is sound---Have 1 question--if i get the LRE 10P and its stamped max 80 PSI but put in 65 PSI will the tire be used up the same---or is the outside wear out faster---meaning if you over-inflate you will use up the center first--is it going to do the same if i only inflate to 65?
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Old 06-05-2015, 04:37 PM   #15
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Your explanation is sound---Have 1 question--if i get the LRE 10P and its stamped max 80 PSI but put in 65 PSI will the tire be used up the same---or is the outside wear out faster---meaning if you over-inflate you will use up the center first--is it going to do the same if i only inflate to 65?
Wish I knew, as I have tried to figure this out with my truck... In theory, if you put 80 psi in them, the center would wear more because they are over-inflated for the load. Whether that happens, I don't know.

Some tire manufacturers publish a load rating vs pressure curve. I would think if that was available, you would take the load rating of the OEM tire (since that is what the trailer, the axles, the rims, the brakes, etc are rated to carry) and find that load on the curve. Then you inflate your new, heavier tires to the pressure that corresponds to the original rated load.
But opinions and practices seem to be all over the map on this one, so I don't see a clear cut answer here when you go to a heavier tire than the OEM supplied.
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Old 06-05-2015, 04:50 PM   #16
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Have a Crusader 290RLT and want to upgrade the Tires--looking at the Carlisle ST225/75R15 they have 2 model --1 is LRD-8P # 5151401 to be inflated to 65 LBS--the other is LRE -10P#5151411 to be inflted to 80 LBS-- Both tires are for a 15 inch rim--if I choose the LRE I have to inflate to 80 LBS will my rim take it--today took 1 wheel off and nowhere do they state PSI rating --only the MAX load 2830LBS--since there is not much difference in pricing but want to be safer with a 10p instead of the
8p--can anyone tell me if the rim is strong enough for 80PSI--Thanks
It should be stamped inside the rim, without removing the tire you will not see it. Here is Series 6 that Rockwood and Flagstaff use chart.
Attached Files
File Type: pdf Rockwood rims.pdf (228.4 KB, 92 views)
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Old 06-06-2015, 06:07 AM   #17
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What was the question/request that you sent to them?

I questioned them about being an ISO certification tire building company, not that means much, also the country of origin, like we didn't already know, and the ability to run a LR E tire at LR D pressure. I know so many people worry about the extra 15psi of air, my wheels do not have a psi. rating, just a max load rating according to them it appears to not be a problem. I believe I will try a LR E around 70-75 psi cold, we will see how that goes. Next step, scales. A LR E tire only has approx. 300lbs more load capacity than a LR D
My wheels are rated to 2830, the same as a LR E tire
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Old 06-06-2015, 08:43 AM   #18
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Do not know if this info will help anyone having to go thru this but here goes---last trip have bought the TST tire monitoring system--on our way back !st trip with the system---chech at the start tire cold at 65 PSI ---temperature outside for that trip was between 82/91 ---the temperature indicated by the system went up to 101degreF ON 3 OF THE TIRES and the pressure went up to 76PSI--ON 2 TIRES DIFF. SIDE--without any trouble---so in theory the Prime Time wheel with no PSI rating stamped ---and 2830 Max load rating stamp are PROBABLY BETTER THEN WE
THINK(hope i'm right) because i'm in the process of buying 4 LRE tires and will run them at 70-75 also.
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Old 06-06-2015, 04:49 PM   #19
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Tire talk

I use a digital infrared thermometer on all tires almost every time I stop along the road. It is my experience that, in all instances, the tires on the side of the vehicle that face the sun will always be 7 to 19 degrees warmer than the shaded tires. Also, in the middle of the day, with the sun overhead (depending on travel direction), temps are very close on all tires.
I am towing a 35' TT with a 163" wheelbase F-150, loaded near maximum weights, no one is going to convince me to not run maximum air pressure in all tires. I understand that pressures will build, but I believe the tire manufacturer has accounted for that.
A TST is next on my list of wants/needs and I will probably second guess it for a short while with my infrared thermometer. Just my $.02 worth.
Travel safe
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Old 06-06-2015, 05:16 PM   #20
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I hear what you are saying and your right for the tire----BUT---this discussing is not in relation to tires but mainly rims--some of us what to change to E type tire and we are not sure if the rims will take the 80 LBS as our RV came with D type that as to be inflated at 65PSI and after taking 1 wheel off to check the max inflation stamping, found it was not shownd.
Re=TST I got the 310 insted of the 307 because it can be used with the rubberSTEMS and got them directly form them at $250 delivered at the RV park 4 weeks ago pre-programmed, all you tell them is the amount of LBS you inflate your tires, I second guess the system also but beleive me its A 1 + no complaints
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