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02-10-2019, 12:12 PM
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#1
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Junior Member
Join Date: Nov 2018
Location: Springfield TN
Posts: 21
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8 ply or 10 ply?
Looking to replace the goodride 8 ply that came on our fifth wheel when we bought it new. Going with the Carlisle 225 75 r15. Max loaded weight of the trailer is 10,500 lbs.
Would it be best to bump up to a 10 ply or is there a reason(air pressure increase, wheels, axles etc.) I need to stay with 8 ply? I know tires are a crucial component, wanna make sure I get it right. Thanks in advance
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02-10-2019, 12:30 PM
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#2
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Senior Member
Join Date: Feb 2016
Location: SE Michigan
Posts: 1,659
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I would suggest going up to the highest load range for that size tire, which is an LRE. You'll gain nearly 300 lbs of reserve capacity per tire.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier
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02-10-2019, 01:05 PM
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#3
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Senior Member
Join Date: Sep 2017
Location: West Central IN
Posts: 141
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I don't disagree with going to LRE, but you only gain the capacity if the wheels are rated for the LRE weight and air pressure as well. The wheel (rim) will have a max weight and air pressure allowed. Only as good as the weakest link.
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Wxman
2018 Passport Elite 19RB (sold)
2021 Jayco Eagle HT 274CKDS
2017 Silverado Z71 5.3L 3.42 gears(sold)
2021 Sierra 2500 4x4 CCSB SLT (gas)
E4 16k/1.6k hitch
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02-10-2019, 01:17 PM
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#4
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Junior Member
Join Date: Nov 2018
Location: Springfield TN
Posts: 21
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Quote:
Originally Posted by Wxman
I don't disagree with going to LRE, but you only gain the capacity if the wheels are rated for the LRE weight and air pressure as well. The wheel (rim) will have a max weight and air pressure allowed. Only as good as the weakest link.
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This was the exact reason I felt the need to ask on here. I thought the wheel would have a stamp on it somewhere about pressure limits but I couldn’t find it. Looked on the backside of it and read through the owners manual. Nothing
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02-10-2019, 01:26 PM
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#5
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Senior Member
Join Date: Sep 2017
Location: West Central IN
Posts: 141
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If it didn't have a max pressure stamp, did it have a max weight stamp on the wheel? If the max weight was up to the LRE weight, or more, I believe the max pressure is 'automatically' up to the corresponding LRE pressure. Metal valve stems above 65psi is the standard for most. Mine have a weight stamp only that I can't read without removing the wheel.
Good luck
__________________
Wxman
2018 Passport Elite 19RB (sold)
2021 Jayco Eagle HT 274CKDS
2017 Silverado Z71 5.3L 3.42 gears(sold)
2021 Sierra 2500 4x4 CCSB SLT (gas)
E4 16k/1.6k hitch
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02-10-2019, 01:33 PM
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#6
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Junior Member
Join Date: Nov 2018
Location: Springfield TN
Posts: 21
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Quote:
Originally Posted by Wxman
If it didn't have a max pressure stamp, did it have a max weight stamp on the wheel? If the max weight was up to the LRE weight, or more, I believe the max pressure is 'automatically' up to the corresponding LRE pressure. Metal valve stems above 65psi is the standard for most. Mine have a weight stamp only that I can't read without removing the wheel.
Good luck
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Good point. I’ll check for a weight stamp the next chance I get. I know it had some stamping on the backside, just nothing about pressure. Had to lay down underneath to look.
Already bought some metal stems. Some of the cheapest insurance available if you ask me.
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02-10-2019, 01:39 PM
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#7
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Senior Member
Join Date: Feb 2010
Location: Taylors, SC
Posts: 3,031
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When contemplating increasing the load capacity of the replacement tires the limiting factor is the wheels PSI limit. Some of their manufacturers rate them with max load capacity and a PSI limit. Others just rate them for the load they can carry which includes the PSI necessary to carry that load.
When the trailer manufacturer selected the wheels and OE tires for your trailer it was for their ability to carry the maximum load of the GAWRs. The GAWRs have not changed so the wheels are good to go as long as they are rated for the increased PSI. The valve stems could very well be rated for 65 PSI and would have to be replaced. Steel valve stems are the best replacements.
The extra load capacity the new tires will provide is; “load capacity reserves”. It’s one of the best durability factors one can purchase with replacement tires.
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02-10-2019, 02:12 PM
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#8
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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Quote:
Originally Posted by River Duck
This was the exact reason I felt the need to ask on here. I thought the wheel would have a stamp on it somewhere about pressure limits but I couldn’t find it. Looked on the backside of it and read through the owners manual. Nothing
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If you have the aluminum wheels (I believe you do), the back should have similar cast markings to these photos. If you have steel wheels, then you'll need to find some identifying info and look them up on the manufacturer's website.
If yours are aluminum there are two "lug patterns" for the casting, the 5 lug wheels are rated at 2150 and 6 lug wheels rated at 2830. The pressure ratings for these wheels equate to the load range for the tire sizes mounted on the wheel. 5 lug=2015= 205 75R15 LRD= 50PSI and in 6 lug rating, = 2830=225 75R15 LRE= 80PSI.
So, essentially, the casting is rated to carry 80 PSI, but the tires mounted on the casting drilled with 5 lug holes can only support 50 PSI...
Anyway, here's the photo of the information cast in the back side of your aluminum wheels.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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02-10-2019, 03:21 PM
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#9
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Senior Member
Join Date: Nov 2017
Location: Mico, TX
Posts: 7,471
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I think that during times when the weather outside is nasty, folks have a tendency to overthink things. Get the 10 ply LRE. They are stouter tires regardless. Has anyone ever heard of a wheel blowing up? Will lawyers haunt your doorstep if you put LRE tires on your trailer? I have had LRE tires on my steel rims for years and not once have they blown up. The tires on my TV have a much higher load rating the the OEM and the truck rims have yet to blow up.
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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02-14-2019, 07:45 PM
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#10
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Senior Member
Join Date: Sep 2018
Location: Akron
Posts: 459
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Quote:
Originally Posted by wiredgeorge
I think that during times when the weather outside is nasty, folks have a tendency to overthink things. Get the 10 ply LRE. They are stouter tires regardless. Has anyone ever heard of a wheel blowing up? Will lawyers haunt your doorstep if you put LRE tires on your trailer? I have had LRE tires on my steel rims for years and not once have they blown up. The tires on my TV have a much higher load rating the the OEM and the truck rims have yet to blow up.
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Switching from LR-D to LR-E and not increaseinginflation above 65 psi will gain you nothing but a lighter wallet.
It is the air pressure that supports the load. If you look at the Load tables for tires you will only see increased load capacity when the inflation increases when dealing with tires of the same size.
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Retired Tire Design Engineer (40 years). Serve on FMCA Tech Advisory Committee. Write a blog RV Tire Safety. Read THIS post on Why Tires Fail.
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