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Old 11-11-2015, 02:54 PM   #1
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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.
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Old 11-11-2015, 03:36 PM   #2
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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
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Old 11-11-2015, 03:55 PM   #3
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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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Old 11-11-2015, 06:55 PM   #4
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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 View Post
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
That theory does not apply to ST trailer tires. With one exception (Maxxis), all trailer tire mfgrs, specify sidewall maximum or void the warranty.
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Old 11-11-2015, 07:23 PM   #5
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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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Old 11-11-2015, 07:30 PM   #6
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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.
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Old 11-11-2015, 07:35 PM   #7
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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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