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  #1  
Old 01-29-2013, 10:12 PM
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Default 20" rims and maximum psi

I have looked everywhere and cannot find the info I need.
I am pretty sure one of you knows the answer.
I am towing a small fifth wheel and changed the Goodyear tires to Michelins LTX/AT2 275/65R20 max load: 3750 lbs. @ 80 psi
I run them at about 50 to 55 psi when loaded.
Question is: I don't think they put in a steel valve in there (but I think I may have found the answer to that, if I run them below 65 psi, that is ok)
http://www.tirerack.com/tires/tirete...jsp?techid=208

My main question is: someone told me to make sure that the rims can take the extra PSI. I looked at the rims and cannot find any maximum numbers on them.
Anyone knows this?

and one more question, is how do I figure how much air I need to add with the extra weight? is there a formula for that?

Thank you!
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Old 01-30-2013, 11:58 AM
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As a younger kid I worked at a rim and tire shop, I have never seen a rim blow out due to going with a higher load rated tire. I don't have an exact answer for you but i'm sure it will be fine! good luck
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Old 02-02-2013, 10:50 AM
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I would not run more than 50 with a rubber valve. Be careful running a michelin at low (below 65psi) while loaded. They have thin soft sidewalls (for better ride) and underinflated can cause a sidewall seperation.
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Old 02-12-2013, 10:19 AM
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Quote:
Originally Posted by CRANKYPISTOL View Post
I would not run more than 50 with a rubber valve. Be careful running a michelin at low (below 65psi) while loaded. They have thin soft sidewalls (for better ride) and underinflated can cause a sidewall seperation.
this is a E rated tire, 10 ply
really?

Should I get the valve stem changed then?
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Old 02-15-2013, 09:52 PM
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All rubber stems are rated at 50psi. There are sone with metal inserts that say they can hold 80 but I have seen alot of them fail. Yes, for the cost.... change the stems.
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Old 02-21-2013, 10:22 PM
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Quote:
Originally Posted by CRANKYPISTOL View Post
All rubber stems are rated at 50psi. There are sone with metal inserts that say they can hold 80 but I have seen alot of them fail. Yes, for the cost.... change the stems.
Going to get some maintenance work done tomorrow. Sound line most people aren't too concerned with the stem valves but since I am getting the tires rotated, small price to pay to get metal stem valves fixed while I am there.
thank you all for the help!
you guys are very helpful

Brigitte
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Old 02-21-2013, 10:35 PM
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I just got put 10 ply tires and I was curious as to what you run them for PSI for day to day driving?
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Old 03-11-2013, 11:15 AM
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Quote:
Originally Posted by BigHornGreg View Post
I just got put 10 ply tires and I was curious as to what you run them for PSI for day to day driving?
Which tires did you get?
I've got 50psi in mine
not sure what the real answer is yet, still waiting on Michelin to reply to my email
Now looking into how much pressure the rims can take
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Old 03-11-2013, 12:44 PM
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The bead seat of the tire will fail before the rims. Just for the record..there are no 10 ply tires. Load Range E are some times referred to as "10 PLY" rated, but they are not 10 ply...3 ply at most for radial tires. I have never heard of a max psi for rubber valve stems. Doesn't your 2010 come with Air pressure monitor system? The valve stem is part of the sensor and not replaceable by itself.
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Old 03-11-2013, 03:38 PM
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yes, Air pressure monitor system.
I was also told it might not work with xtra psi, but we had the tires inflated to 55psi last summer for towing down east and the toms worked just fine.
Thanks for the info.
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