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Old 05-22-2019, 07:14 AM   #1
CWtheMan
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The ST235/80R16 LRE

There is a fallacy with the Goodyear Endurance designated size ST235/80R16 LRE. It has a maximum load capacity of 3420# at 80 PSI. Therefore, it is not qualified for service on vehicle certified 7000# GAWR axles.

Before 2017 when the RVIA 10% reserve load capacity recommendation kicked-in, Keystone had numerous vehicle certification label recalls because they failed to properly identify which load capacity tire they used on the 7K axles. There is a standard in FMVSS that says any tire with identical size designations having more than one load capacity in a load range field (LRE); the load range of the tire with the highest load capacity - 3520# - defaults to the lowest load capacity - 3420# unless the higher load capacity has been designated and documented with NHTSA as the proper fitment for that trailer. On those recalls Keystone took the easy way out and did the math and issued replacement labels certifying the 7K axles to 6750#/6800#. Then they always installed brand named tires with 3520# of load capacity on 7K axles and provided the necessary documentation to NHTSA to support that action.

Those of you with trailers having 7K vehicle certified axles with OEM ST235/80R16 LRE tires should never use replacement tires with less load capacity than the OEM tires provided, that includes the GY Endurance of that designated size and load range.

Here are two pictures I took at RV shows that show how Keystone did the certification labels to accommodate two of three different load capacities of the ST235//80R16 LRE tires. (The other load capacity is 3500# and is manufactured by just a couple of brand names. Kenda is one of them.).

http://www.keystoneforums.com/forums...pictureid=6376
http://www.keystoneforums.com/forums...pictureid=6377

Note: Another popular brand in that size with 3420# max load capacity is Maxxis. Carlisle is 3520#.
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Old 05-22-2019, 09:26 AM   #2
cookinwitdiesel
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Sailun has a S637T in this same size as well although it is rated up to 110 PSI and much higher load.

http://www.gosailun.com/MRT/Tire/S637T

Is it safe to assume that the Goodyear Endurance is more than sufficient for a 5200# axle? (That is the combo I am considering on my new trailer I am getting soon)
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Old 05-22-2019, 11:37 AM   #3
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Cal this is good, as a 7K axle deserves an all steel ply LRG tire, not a over rated ST235/80R16E poly carcass tire. Chris
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Old 05-22-2019, 11:57 AM   #4
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Quote:
Originally Posted by cookinwitdiesel View Post
Sailun has a S637T in this same size as well although it is rated up to 110 PSI and much higher load.

http://www.gosailun.com/MRT/Tire/S637T

Is it safe to assume that the Goodyear Endurance is more than sufficient for a 5200# axle? (That is the combo I am considering on my new trailer I am getting soon)
Vehicle certified 5200# axles will require tires with a maximum load capacity of 2860# to qualify under the RVIA reserve load capacity recommendation. The very popular ST225/75R15 LRE at 2830# does not qualify. There are all steel LRF tires in that size that have 3195# of load capacity but they are much more expensive (IMO) than Keystone will want to use as OEM. So, your new trailer with 5200# vehicle certified axles will most likely come with Original Equipment ST235/80R16 LRE tires. IMO the ideal fitment would be LRD (3000# @ 65 PSI), but very few manufacturers build that load range for that sized tire anymore.
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Old 05-22-2019, 12:17 PM   #5
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Quote:
Originally Posted by Snoking View Post
Cal this is good, as a 7K axle deserves an all steel ply LRG tire, not a over rated ST235/80R16E poly carcass tire. Chris
I agree on the 7K comment. However, the OP is interested in a new trailer with 5200# axles.

I'm a fan of the steel cased tires. Greenball has introduced a 15" all steel ST225/75R15 LRF to the ST market place. It has a 3195# load capacity @ 95 PSI. Time will tell if other manufacturer's will follow suit like they did when Sailun introduced their two 16" steel cased tires. Even Carlisle, who is rising again in name popularity with their huge improvements in quality products, now have very sturdy looking 16" steel cased tires on the market. I think
Michelin & Bridgestone missed a great chance to steal a huge part of the ST market by failing to build steel cased ST tires when they were the only ones building steel cased tires.
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Old 05-24-2019, 11:42 AM   #6
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What would the thinking be on running the Sailun S637T @ only 80 PSI vs Goodyear Endurance for a TT with 5200# axles? Are the Sailuns considered higher quality/better in the long run? Are there any negatives to running a trailer tire under its max PSI rating (Sailuns are rated up to 110 PSI but would be replacing the 80 PSI OEM tires - think the rims may be 80 PSI limited, will confirm once I take delivery of the new trailer).
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Old 05-24-2019, 12:06 PM   #7
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Our previous 5th wheel had 5200 lb axles and at weight of around 12,400 with 10K on the axles. A ran Michelin XPS Ribs for 7.5 years and Brdigestone Duravis R250 for 4 years. I started at 65 PSI based on the OEM china bomb Kenda LT235/85R16E tires. I notice a still more wear on the Ribs outer rib, so I up pressure to 71 psi and tread wear for very even after that. Sailun makes the S637 is bother ST235/80R16G and ST235/85R16G. Choose the size that works for the trailer and 80 psi will be more than you really need for the load.

As a side note, Michelin and Bridgestone could have easily slapped ST in the RIB and R250 and rated then to 75 MPH, however they would not have appeal to the OEM manufactures because of cost. That is exactly what the CEO of NuWa told me, when I challenged him to use the XPS Rib in place of the Uniroyal Laredo LT.

Chris
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