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Old 07-11-2016, 02:07 PM   #1
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Rim psi rating

Looking for a little help figuring out my 5th wheel rim psi. It is stamped 3960lbs but I don't know how that translates to psi. My bayhill has a gvwr of 16200 and has two 7000lb axles. I shredded 3 China bombs with less than 2000 miles on them coming home from vacation and I need to get order some tires today that are actually up to the task of getting from point a to point b! I'm not looking to replace rims so I'm trying to figure out how to convert load lbs to psi.

Thanks, Scott
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Old 07-11-2016, 02:52 PM   #2
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Wow, sounds like your axles are under rated for your TT.
Where did you get the GVWR?

The rims are under spec'd also for 16200

Two 7Klb axles is quite a bit shy of the 16200 you posted.

At this point the PSI rating does not make any difference.

Was something mistyped?

Dan
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Old 07-11-2016, 03:54 PM   #3
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Part of the weight is on the pin. My trailer is 17400 with 8K axles. Can't help but psi is supposed to be stamped on back of rim.


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Old 07-11-2016, 06:20 PM   #4
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Old 07-11-2016, 06:21 PM   #5
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Old 07-11-2016, 06:47 PM   #6
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Sailun Commercial Truck Tires: S637T HD ST Trailer

These were the tires I was leaning towards buying.
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Old 07-11-2016, 06:56 PM   #7
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Powermaker.... here's what I suggest... take your trailer to a truck stop and run your trailer across the truck scale... it will cost you from $5 to $10... have them weigh both axles together so you can understand what weight is on the ground... and than weigh each axle independently... for me... I live in a state where when the weight stations are closed... the scales and outdoor reader board is still lit... so I've been by a set of scales with the truck only, knowing the weight of each axle... than with the trailer... you'll gain a lot of information...

The max weight on the wheel is just that... I only use LT (light truck) tires on my 5er... on LT tires I went to the manufactures web site and followed the manufactured suggested air pressure to support the weight I needed... remember that on passenger tires... the rating on the side of the tire is a max rating.. on a LT and heavy truck tire, that rating is for that specific weight... and in some cases you can run more air pressure in a LT than what is on the sidewall... by following the published guideline...
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Old 07-11-2016, 07:12 PM   #8
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Your sticker shows 80 psi cold and if no max psi is on the rim , I'd be inclined to contact the 5er's manufacturer for the name of the rim supplier and get the psi rating directly from them. If you are re-using the rims be sure when you go to a higher psi tire that you up-grade to metal valves , rubber valves have a 65 psi limit , rubber/brass about 95 and metal are good to 200 psi.

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Old 07-11-2016, 07:15 PM   #9
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Quote:
Originally Posted by powermaker View Post
Looking for a little help figuring out my 5th wheel rim psi. It is stamped 3960lbs but I don't know how that translates to psi. My bayhill has a gvwr of 16200 and has two 7000lb axles. I shredded 3 China bombs with less than 2000 miles on them coming home from vacation and I need to get order some tires today that are actually up to the task of getting from point a to point b! I'm not looking to replace rims so I'm trying to figure out how to convert load lbs to psi.

Thanks, Scott
With that weight rating your rims were clearly designed for ST tires. The ST235/85R16F is rated at 3960# at 95 PSI. However, other trailer tires such as the LT235/85R16G rated at 3750# at 110 PSI will not exceed the rim's load capacity. Depending on the MFG your rims should be size 16X6.5".

Here is a link to a common OEM rim provider of the size you have.

TR8 | Sendel Wheels
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Old 07-11-2016, 07:18 PM   #10
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Thanks Jelag, I would love to take the rv to the scales but I limped home on 1 spare china bomb, 1 unblown china bomb, 1 already blown china bomb(exterior is separated with a softball size bubble) and 1 new goodyear marathon that I had put on by a roadside tire guy. I'm going to either chance it the few miles to the shop or take the wheels off and take them in myself.
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Old 07-11-2016, 07:21 PM   #11
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Originally Posted by Skip426 View Post
Your sticker shows 80 psi cold and if no max psi is on the rim , I'd be inclined to contact the 5er's manufacturer for the name of the rim supplier and get the psi rating directly from them. If you are re-using the rims be sure when you go to a higher psi tire that you up-grade to metal valves , rubber valves have a 65 psi limit , rubber/brass about 95 and metal are good to 200 psi.

Tire Tech Information - Tire Valve Types, Components & Uses
Thanks for the tip, but my manufacturer (Evergreen BayHill) went out of business 2 days after I bought the 5ver!
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Old 07-11-2016, 07:25 PM   #12
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Quote:
Originally Posted by FastEagle View Post
With that weight rating your rims were clearly designed for ST tires. The ST235/85R16F is rated at 3960# at 95 PSI. However, other trailer tires such as the LT235/85R16G rated at 3750# at 110 PSI will not exceed the rim's load capacity. Depending on the MFG your rims should be size 16X6.5".

Here is a link to a common OEM rim provider of the size you have.

TR8 | Sendel Wheels
FastEagle, they are stamped 16x6.50. So in your opinion would the sailun ST235/80R16 work for my application?
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Old 07-11-2016, 07:44 PM   #13
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FastEagle, they are stamped 16x6.50. So in your opinion would the sailun ST235/80R16 work for my application?

Yes? Providing its the 3750# version. They also build a very similar tire with a 4080# capacity which is over the limit of your rims so it would be a judgement call to use them on the premise the actual 3960# rating would not be exceeded.
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Old 07-11-2016, 07:58 PM   #14
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Yes? Providing its the 3750# version. They also build a very similar tire with a 4080# capacity which is over the limit of your rims.
I noticed on the link i posted that there were two different weight ratings also. the 4080# and 3640#. It says the 4080# is for "load carrying capacity single" and the 3640# is for "load carrying capacity dual". Is that referring to single vs dual axles? So there are actually 2 different ST235/80R16 model of tires? Sorry for all the questions.
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