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Open Roads Forum  >  Towing

 > Exceeding Rim Recommended Max PSI

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mitch5252

NW Tennessee

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Posted: 02/20/12 10:41am Link  |  Print  |  Notify Moderator

If my aluminum wheels are rated for 60 PSI, would I be safe putting on replacement tires with an inflation of 65 PSI (same size, 14", as originals)?

Thanks for your input.

Regards,
Michelle


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PapPappy

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Posted: 02/20/12 10:51am Link  |  Print  |  Notify Moderator

I doubt that the 5 psi would make much difference, but then again, they are rated for a reason. More than likely, that rating number (60 psi) will still allow for at least 15% overload, so that would be an additional 9 psi, so you'd be good, as long as the rim is in good condition.
You may want to replace the valve stem to a metal or high-pressure stem.


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ScottG

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Posted: 02/20/12 11:24am Link  |  Print  |  Notify Moderator

At the risk of all things good and evil coming to an end, I would go ahead and do it. 5 psi just isn't going to make any difference to the wheel and may allow it to run cooler since there will be less flex of the tire.


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coolbreeze01

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Posted: 02/20/12 11:42am Link  |  Print  |  Notify Moderator

I wouldn't worry, but I'm no expert......


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Posted: 02/20/12 11:18am Link  |  Print  |  Notify Moderator

Why would you want to PURPOSELY exceed a maximum.......Can you do it....sure..has someone else done it....no doubt...can you exceed the speed limit on curves....sure...has someone else done it....no doubt...I've seen those small white crosses from those who did and FAILED, because they thought they knew more than the engineers that designed the rims/roads/curves..........Dennis


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jerem0621

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

I would probably air the tires up using the static load radius (SLR). All things being equal a lightly loaded tire rated to max psi would have a taller than optimal static load radius.

Lets use some hypothetical numbers here.

225/75r15 should have a static load radius of 13 inches, what about load C, D, E? Etc. the principal is the same. Every tire has a working radius it is designed for at a max psi. A class E tire in the size above should be about 26 inches high, or 13 inches from the center of the hub to the ground. If the tire has 80 psi and is only carrying 2/3 of the load the. The static load radius will be higher than 13 inches and some air would need removed to achive optimal SLR.

Op check your SLR and then adjust the air pressure depending on the load.

Here is a link to more info on SLR

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BenK

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Posted: 02/20/12 02:30pm Link  |  Print  |  Notify Moderator

Maybe within the margins of design for 'that' wheel, but it's your risk management
decision and none of the advisers will have to suffer the result

I used to work as a tire monkey working my way through college and have experienced
a tire that blew up while the guy a few bays down was seating the bead

The whole building shook and we thought the front window was going to blow out

So many other thing to take into account. What condition is that wheel in?
Any stress raisers? What size tire is going on there? What is the expected loading?

You are contemplating just under a 10% increase in wheel spec PSI and wonder
what the design margins are...


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Posted: 02/20/12 04:53pm Link  |  Print  |  Notify Moderator

Vulcaneer wrote:

mitch5252 wrote:

If my aluminum wheels are rated for 60 PSI, would I be safe putting on replacement tires with an inflation of 65 PSI (same size, 14", as originals)?


Sure you can put those tires on those rims. Just fill the tires with 60PSI max.


Exactly. why would you need to inflate the tires to 65 PSI anyway?


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Vulcaneer

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Posted: 02/20/12 02:33pm Link  |  Print  |  Notify Moderator

mitch5252 wrote:

If my aluminum wheels are rated for 60 PSI, would I be safe putting on replacement tires with an inflation of 65 PSI (same size, 14", as originals)?


Sure you can put those tires on those rims. Just fill the tires with 60PSI max.


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Old-Biscuit

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Posted: 02/20/12 01:06pm Link  |  Print  |  Notify Moderator

PapPappy wrote:

I doubt that the 5 psi would make much difference, but then again, they are rated for a reason. More than likely, that rating number (60 psi) will still allow for at least 15% overload, so that would be an additional 9 psi, so you'd be good, as long as the rim is in good condition.
You may want to replace the valve stem to a metal or high-pressure stem.


IIRC the increase in pressure due to heat has already been factored in to the MAX PSI rating.......in this case 60#
If tire & rim is at 60# and the pressure increases to 70# due to road/air temps....tire friction etc. then the so called 'allowable overload' has been reached/exceeded ????

If inflated to 65# MAX on tire and 5# over MAX on rim...and pressure increases while running down the road to 75# that's a 25% increase over the rim MAX PSI rating......OK for tire but could result in rim failure. Rims & tires have MAX PSI ratings for a reason......safety!

Sure one could put a 65# MAX PSI rated tire on a 60# MAX PSI rated rim (provided it properly fits the rim) and only inflate to 60# (or 60# tire on 65# rim)------lowest MAX PSI rating----BUT later on will somebody remember/know that the rim is rated lower than tire??

Best to always match MAX PSI ratings....then both tire & rim are being properly utilized in a safe manner.

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