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11-11-2015, 01:54 PM
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#1
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Member
Join Date: Mar 2015
Location: Golden, CO
Posts: 90
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Increasing the load rating of my TT tires
I currently have a dual axle TT with load range D tires and wheels. Of course the tires and wheels are rated at the minimum required to carry the trailer. Nothing new there as almost all RV's are engineered that way. I am considering going up a load range. The reasoning here is that a load range higher tires and wheels will be less prone to the well known saga of ST tire failure. I think that is sound reasoning but please correct me if I'm wrong. My main question centers around the point that an increase in load range means an increase in tire pressure. My concern is that a tire with a higher inflated pressure will not be as forgiving when going over bumps and potholes. What I mean by that is that the jarring on the TT will be harder and thus increase wear and tear on the TT. We all know about RV manufacturing standards and Quality Control and it concerns me. I can't financially go out and buy another TT when it suits me. I have this one and it has to last.
__________________
Dale and Deb
2016 Jay Flight 27BHS TT
2009 Silverado 2500 6.6L Duramax
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11-11-2015, 02:36 PM
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#2
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Member
Join Date: Mar 2015
Location: Golden, CO
Posts: 90
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Sorry - I have load range C tires. They are 205/75 14. If I move up to D the pressure increases from 50 to 65 psi
__________________
Dale and Deb
2016 Jay Flight 27BHS TT
2009 Silverado 2500 6.6L Duramax
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11-11-2015, 02:55 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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You are not FORCED to go up in the psi...
(and even if you were, the 15 psi difference is not THAT much)
if you look at most tire mfg specs, their psi minimums change based on "load inflation tables"
FOR EXAMPLE, from the toyo chart below:
if you put 26 psi in that tire, it can carry 1188 lbs
if you put 29 psi in that tire, it can carry 1272 lbs, etc...
so you weighs your LOADED vehicle, and from the weight you put the psi's in with a little lagniape
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'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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11-11-2015, 05:55 PM
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#4
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,903
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IMO, you will do well with the higher LR tires. The springs absorb road shock, the shocks simply reduce spring rebound.
Tires will build more heat as air pressure is reduced. Heat is the #1 killer of tires.
Quote:
Originally Posted by JohnBoyToo
You are not FORCED to go up in the psi...
(and even if you were, the 15 psi difference is not THAT much)
if you look at most tire mfg specs, their psi minimums change based on "load inflation tables"
FOR EXAMPLE, from the toyo chart below:
if you put 26 psi in that tire, it can carry 1188 lbs
if you put 29 psi in that tire, it can carry 1272 lbs, etc...
so you weighs your LOADED vehicle, and from the weight you put the psi's in with a little lagniape
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That theory does not apply to ST trailer tires. With one exception (Maxxis), all trailer tire mfgrs, specify sidewall maximum or void the warranty.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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11-11-2015, 06:23 PM
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#5
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Senior Member
Join Date: Feb 2009
Location: Ca
Posts: 1,076
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I went from Load Range C to E's and 205 to 225. Had 15" rims however. From 50 psi to 80psi, no problem. Maxxis tires.
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11-11-2015, 06:30 PM
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#6
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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You need to check the max. pressure rating of the wheels. If they won't take the higher pressure they will need to be changed too, unless you don't need to run higher pressure. But, most manufactures say to run the pressure at the max all the time.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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11-11-2015, 06:35 PM
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#7
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Get E rated Maxxis and be done with it. Great tires that are higher rated and lower cost than LT's. (If your drive 80 mph+ get the higher priced LT's)
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2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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