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Old 10-08-2016, 09:11 PM   #15
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You are forgetting about the weight on the pin box.

Our trailer is 15,000# GVWR (10,300# dry) on two 6,000# 8 lug axles. 3,000# on the pin box at GVWR.

Please check my post #11.
Got it. My GVRW is 16500 so that is max it can be loaded right? So cargo cant exceed 3100 so roughly the trailer weighs 13400 dry? My axles are 7000lb and hitch weight is 3230lbs. So I need tires that can hold 3500lbs each correct?

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Old 10-08-2016, 11:35 PM   #16
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3500 lbs is the minimum however tire experts tell us a trailer needs around 10-15 percent reserve capacity. Tires on a trailer have a lot more ply shear forces from side scrubbing as it roll around corners. So they need a stiff sidewall tire like the LT and ST tire.

Here's some history for you.
Before the tire industry came up with the ST (special trailer) tire we used passenger (P) and light truck tires (LT) on our trailers (rv and non rv).
Carlisle and Goodyear Marathons were out first with ST tires. They were advertised as a compromise between the P and LT class tires.
LT tire were very expensive compared to a P tire plus the LT had more load capacity. The ST fit right in the middle cost and performance wise and had more capacity than the LT in the same size.
However the down side of the ST class tire back then was a very poor reliability record. A google on the subject has years of reading and it ain't pretty even with some of todays brands of ST class tires.

I would look at a commercial class all steel ply carcass ST tire like the Sailun S637 in a ST235/80-16 G at 4080 lbs capacity. I run these on a triaxle 36' GN stock trailer with 7k axles.

Another commercial class all steel ply carcass tire is the G614 mentioned. It comes in a LT235/85-16 G at 3750 lb capacity. Both tires carry a 110 psi rating so make sure your wheels are rated for those higher loads and pressures.

The Provider in a ST235/85-16 G at 4080 lbs ....110 psi is a popular tire with commercial haulers on their trailers. These are OEM on certain brands of equipment trailers.
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Old 10-09-2016, 07:09 AM   #17
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Sailun G rated, all steel. 235-85R16 is the size I chose for my Pinnacle. Replaced the wheels also and they are rated 110psi to run the Sailuns.
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Old 10-09-2016, 09:08 AM   #18
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Got it. My GVRW is 16500 so that is max it can be loaded right? So cargo cant exceed 3100 so roughly the trailer weighs 13400 dry? My axles are 7000lb and hitch weight is 3230lbs. So I need tires that can hold 3500lbs each correct?
You are correct, sir!

The posts following yours are very good. Just like you can't have too much tow vehicle, you can't have tires with too high a weight rating (within reason).

The LT tires rated 3042# that I use are not good enough for your trailer.
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Old 10-09-2016, 09:56 AM   #19
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You are correct, sir!

The posts following yours are very good. Just like you can't have too much tow vehicle, you can't have tires with too high a weight rating (within reason).

The LT tires rated 3042# that I use are not good enough for your trailer.
Thank you all!!!! So how do I know what PSI my wheels are rated for?
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Old 10-09-2016, 10:07 AM   #20
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I think my wheels are only rated to 80psi. So what brand of 8 lug wheel would I look at to get that will hold the PSI of the Sailuns?
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Old 10-09-2016, 10:28 AM   #21
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I think my wheels are only rated to 80psi. So what brand of 8 lug wheel would I look at to get that will hold the PSI of the Sailuns?

I have the same question for those of you who have replaced the wheels which ones have you chosen to not ruin the look of your rig?
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Old 10-09-2016, 10:36 AM   #22
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I think my wheels are only rated to 80psi. So what brand of 8 lug wheel would I look at to get that will hold the PSI of the Sailuns?
Contact ronald_russel@sbcglobal.net. he supply tires and wheels to owners on the Redwood forum at great discounts. Goodyear or salient, G614 or H 6114 also has a selection of rims. I ordered a set of H,s delivered right to my door
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Old 10-09-2016, 10:37 AM   #23
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Sailun G rated, all steel. 235-85R16 is the size I chose for my Pinnacle. Replaced the wheels also and they are rated 110psi to run the Sailuns.
Which wheels did you go with?
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Old 10-09-2016, 12:10 PM   #24
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Contact ronald_russel@sbcglobal.net. he supply tires and wheels to owners on the Redwood forum at great discounts. Goodyear or salient, G614 or H 6114 also has a selection of rims. I ordered a set of H,s delivered right to my door
Email address invalid it says.
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Old 10-09-2016, 02:46 PM   #25
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You can get some very reasonable pricing if you stick with 16” tires. Here are some options. Keep in mind that most LRG 16” LT tires are designed for trailer service only, just like ST tires.

LT235/85R16G 3750# of load capacity at 110 PSI.
ST235/85R16F 3960# of load capacity at 95 PSI.
ST235/85R16G 4080# of load capacity at 110 PSI

It’s very important to remember that the steel cased LT & ST tires require high pressure rims sized 16x6.5”. They are so serious about that 6.5” width requirement they put it right on the tire’s sidewall. Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29709

The 4080# ST tire is becoming very popular and has a 75 MPH speed letter (L). Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29711

The LRF tire is probably more available than most of the others because Discount Tire carries one of the brands that make that sized tire. And, most Discount Tire stores will change them out on site.
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Old 10-09-2016, 04:07 PM   #26
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You can get some very reasonable pricing if you stick with 16” tires. Here are some options. Keep in mind that most LRG 16” LT tires are designed for trailer service only, just like ST tires.

LT235/85R16G3750# of load capacity at 110 PSI.
ST235/85R16F3960# of load capacity at 95 PSI.
ST235/85R16G4080# of load capacity at 110 PSI

It’s very important to remember that the steel cased LT & ST tires require high pressure rims sized 16x6.5”. They are so serious about that 6.5” width requirement they put it right on the tire’s sidewall. Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29709

The 4080# ST tire is becoming very popular and has a 75 MPH speed letter (L). Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29711

The LRF tire is probably more available than most of the others because Discount Tire carries one of the brands that make that sized tire. And, most Discount Tire stores will change them out on site.
What brand are these again? Mine takes and 235/80R/16 tire, will the 85R work?
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Old 10-09-2016, 04:28 PM   #27
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Originally Posted by FastEagle View Post
You can get some very reasonable pricing if you stick with 16” tires. Here are some options. Keep in mind that most LRG 16” LT tires are designed for trailer service only, just like ST tires.

LT235/85R16G3750# of load capacity at 110 PSI.
ST235/85R16F3960# of load capacity at 95 PSI.
ST235/85R16G4080# of load capacity at 110 PSI

It’s very important to remember that the steel cased LT & ST tires require high pressure rims sized 16x6.5”. They are so serious about that 6.5” width requirement they put it right on the tire’s sidewall. Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29709

The 4080# ST tire is becoming very popular and has a 75 MPH speed letter (L). Here is a picture.

http://www.irv2.com/photopost/showfull.php?photo=29711

The LRF tire is probably more available than most of the others because Discount Tire carries one of the brands that make that sized tire. And, most Discount Tire stores will change them out on site.
I am not sure but my factory wheels only take up to 80lbs I think.
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Old 10-09-2016, 05:53 PM   #28
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I am not sure but my factory wheels only take up to 80lbs I think.
If you are lucky the psi rating is stamped on the backside of the wheel. Probably have to remove the wheel to see it.

If you are not so lucky, the rating might be on the surface of the wheel inside the tire.

Remember, don't assume!
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