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Open Roads Forum  >  Towing

 > Exceeding Rim Recommended Max PSI

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smkettner

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Posted: 02/20/12 04:55pm Link  |  Print  |  Notify Moderator

Fill to 60psi cold and you are good to go.
Cold is in the morning before the sun hits them.


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Posted: 02/20/12 05:18pm Link  |  Print  |  Notify Moderator

Weigh the rig to determine the load on the tires adjust pressure accordingly. You should not need to have over 60 PSI probably less.


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mitch5252

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Posted: 02/20/12 05:31pm Link  |  Print  |  Notify Moderator

OP here...

I thought that both under- and over- inflated were bad things in the tire world?


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Posted: 02/20/12 06:00pm Link  |  Print  |  Notify Moderator

Under-inflated for the load they carry is bad. Find a load inflation table for your size tire at 60 psi and see if the weight listed is enough. If not, upgrade whatever components necessary.


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JIMNLIN

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Posted: 02/20/12 06:49pm Link  |  Print  |  Notify Moderator

The advantage of a higher load range tire comes at those higher pressures. Its been my experience sticking with a tire that has the same pressure rating as my trailers wheels works best in the long run.

If your trailer came with load range C tires (50 psi). I would stick with a load range C tire if you have the single axle trailer. That way you can run them at max pressures for a cooler operating/longer lasting tire.

Some aluminum wheel max pressures are dictated by the valve stem. The low pressure rubber valve stems are rated at 60 psi max. Install the high pressure rubber stems with the brass centers (OEM on our 2500/3500 trucks). Their rated up to 100 psi.
Now if your wheels are stamped 60 psi max then 60 psi is all I would put in them.


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Posted: 02/20/12 08:12pm Link  |  Print  |  Notify Moderator

I would run the tire at 60 psi, so as not to exceed the pressure rating of the wheel.


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smkettner

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Posted: 02/20/12 09:00pm Link  |  Print  |  Notify Moderator

mitch5252 wrote:

OP here...

I thought that both under- and over- inflated were bad things in the tire world?


If you had a 50 psi tire and replaced with a 65 psi tire of same size then it has the same load rating at 50 psi. More load rating at 55, 60 and max rating at 65 psi. You don't need the max rating. 60psi keeps you well over the actual load rating of the previous tire at 50 psi.

jerem0621

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Posted: 02/20/12 09:32pm Link  |  Print  |  Notify Moderator

smkettner wrote:

mitch5252 wrote:

OP here...

I thought that both under- and over- inflated were bad things in the tire world?


If you had a 50 psi tire and replaced with a 65 psi tire of same size then it has the same load rating at 50 psi. More load rating at 55, 60 and max rating at 65 psi. You don't need the max rating. 60psi keeps you well over the actual load rating of the previous tire at 50 psi.


X2, Look at the load rating on the Tire. That is the load the tire is designed to carry at max PSI.

Your tires will be just as rigid at a lower PSI with an equally LOWER load on them.

Thanks!

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Chuck&Gail

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Posted: 02/20/12 10:05pm Link  |  Print  |  Notify Moderator

Would I personally overload my rims by 8.33% ON PURPOSE? NOPE! Do I think it is safe, NOPE. Would I purposely overload my tires? Nope. I prefer safety margins, not overloading.


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Posted: 02/21/12 09:16am Link  |  Print  |  Notify Moderator

I use the same rims as the OP and I too am going to install LR D tires on these rims. I checked with the RV manufacturer, told them what I was wanting to do, and he said he would check with their wheel supplier. He called me back this morning and said the wheel supplier gave the okay to inflate these wheels to 65 psi cold with load range D tires.
The weight limit of 1900 pounds per wheel should still be observed.

So my plan is to use LR D tires, inflated to 65 psi. This will increase the load capacity from 1760 ( LR C at 50 psi ) to 1900 ( wheel capacity limit, tire capacity would be 2094 at 65 psi, but we're limited to 1900 ).
The higher pressure tire should also run cooler due to less flex.

I will also use metal valve stems.

My plan is to use either Hankook RA08 or Kumho 857. I'm leaning toward the Hankook.

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