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Open Roads Forum  >  Tech Issues

 > Wheel Pressure Rating

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Papa & Mimi

Mount Pleasant, SC,

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Posted: 06/22/12 10:01am Link  |  Print  |  Notify Moderator

My camper came with 6 ply 205/75R/15 tires on my camper. The pressure rating is for 50 PSI with a load raging of 1820 lbs.
I have found the same size tire with an 8 ply rating. BUT it takes 65 PSI.
Will the wheel (that the tire is mounted on)take the 65PSI pressure required of the 8 ply tire?
Where can I find out that information.
Thanks and God Bless
Papa
Moved to Tech Issues forum from DIY.

* This post was edited 06/22/12 03:00pm by an administrator/moderator *

ScottG

Bothell Wa.

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Posted: 06/22/12 10:04am Link  |  Print  |  Notify Moderator

Unfortunately that is usually embossed into the rim so you have to remove the tire to see it. Personally, I wouldn't worry about another 15PSI with your wheels. I don't believe it would hurt them in any way.


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kaydeejay

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Posted: 06/22/12 10:47am Link  |  Print  |  Notify Moderator

Your 8-ply tires will carry 1820# at 50psi.
Unless your 6-plys are overloaded you really don't need max pressure.


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falconman

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Posted: 06/22/12 11:44am Link  |  Print  |  Notify Moderator

I would worry about the weight rating more than the pressure. As long as you don't exceed the weight carrying capacity you should be fine with 65 psi if its needed. Always wondered what a rim looks like that failed solely from too much pressure, anyone seen one?

bob213

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Posted: 06/22/12 10:45am Link  |  Print  |  Notify Moderator

15 lbs. doesn't seem like much but keep in mind it is a 30% increase over what that rim is holding now. If you do it, make sure you get metal valve stems or high pressure at the least.

christopherglenn

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Posted: 06/22/12 11:08am Link  |  Print  |  Notify Moderator

Pull a rim and check. I pull a rim on everything (but my bike) just to make sure I can change a tire if need be. Wipe the inside of the rim, and the weight rating and max psi should be stamped into it.
15 psi is alot! If you have a compressor, dump 15 psi of air out of one of your tires - lower one to 35 psi. compare what it looks like to the 50 spi tire next to it.


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Chuck&Gail

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Posted: 06/22/12 02:33pm Link  |  Print  |  Notify Moderator

Rating usually stamped on rear of wheel, or in valley UNDER the tire.

Personally I would not overload any of MY rims by 30%!!!!!


Chuck
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Old-Biscuit

Verde Valley

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Posted: 06/22/12 01:13pm Link  |  Print  |  Notify Moderator

A pressure vessel rating is a combination of structural design, materials used, construction methods etc. plus a safety margin due to effects of temperature.

A wheel/tire combo is a pressure vessel.

A 50 psi rating is MAX cold pressure.....pressure will increase due to rise in temperature. This is where the designed safety margin comes in.
Increasing pressures above the stamped rating eliminates the designed safety margin.

Having operated pressure vessel my whole career and witnessing the effects of ratings being ignored.......no thanks!
Do as you 'think' but ask yourself 'why have pressure ratings'.

Why would it NOT be OK to exceed weight rating but OK to exceed pressure rating


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