What Pressure Should Trailer Tire Rated at 80 PSI Max be Inflated to

Question

Question:

I have a single axle boat trailer with 5.30 X 12 bias tires. The only psi stated on the tire is Maxium load psi is 80 psi Cold. What tire pressure should I maintain them? Thanks

asked by: Denny R

1

Helpful Expert Reply:

Trailer tires should be inflated when they are cold and should be inflated to the max psi rating on the sidewall. In your case you would want to run 80 psi.

If you don't inflate them to the max psi figure you will lose weight capacity and potentially cause the tires to overheat and fail.

expert reply by: Jameson C

1

Pj A.

1/10/2021

OK...so I see you are recommending the max pressure COLD. What if I live in Flagstaff AZ...7000 feet elevation in winter and it is 32 degrees when I measure the PSI. What does your COLD mean? 60 degrees is cold in Phoenix AZ...

Reply

Jon G.

1/14/2021

The cold psi means the psi rating after the trailer has been sitting overnight. When you start heading down the highway the tires will naturally heat up so when we are saying cold we mean when the trailer hasn't been towed around for a while.

Reply

Pj A.

1/21/2021

@JonG Thanks for your response Jon. I'm not sure I phrased my question clearly. When I measure the PSI of my tires before heading down the highway and the air temp is 32 degrees, I'm going to get a different reading than if I measure the PSI of my tires before heading down the highway and the air temp is 60 degrees. The reason I am asking is that if I fill my trailer tires to 80 PSI in Flagstaff with the air temp at 32 degrees and head down the highway to Phoenix where the air temp is MUCH higher (70-80 degrees by the time I arrive) will the pressure in my tires be too high?

Reply

Jon G.

1/21/2021

@PJA Ah, I see now. In that case, yes, it would be possible that your pressure would be too high. If you're going to be traveling to climates that change that drastically in 1 trip then you might consider getting a TPMS (tire pressure monitor system) to install on your trailer. This will allow you to actively monitor your tire pressure and have alerts set to go off if your pressure or temperature get too high. Attached is a link to our selection for you to filter through.

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dept-pg-tpms_sensor.aspx

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See All (5) Replies to Pj A. ∨

Answer 1

I can end this debate for you real fast! Trailer tires, which will have an ST in front of the size, should always be inflated to the maximum psi indicated on the tire. Trailer tires usually do not have a recommended and maximum psi indication so I am…

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Answer 2

On a towing setup you are always limited by the lowest rated component as the overall towing capacity since that is the weakest point. When it comes to trailer tires you always want to have them inflated to their max psi when cold. Not only do you…

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Answer 3

The difference in section width between a 5.30-12 and a 145/12 is just 0.1 inches. Only half of that is applied towards the trailer. On wheel and tire combo #AM35354 the wheel is a black mod wheel with a zero offset meaning that the mounting surface…

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Answer 4

The number of plies a tire has no longer has a direct correlation to the weight capacity of a tire as manufacturers have begun to use stronger material which means fewer plies and a higher weight capacity. The figure that is now used instead of plies…

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Answer 5

As long as you have the needed wheel well and trailer frame clearance, there is no reason that you couldn't go to a larger tire size from your existing 5.30-12 tires. The next size up from what you have is going to be with an ST175/80-13 size…

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Answer 6

One main difference between LED lights and incandescents is the amount of power each one draws. I did a little research and found that if you were to have LEDs and incandescents on the same circuit, it would be too much power draw for the LEDs…

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Answer 7

The psi should be listed on the sidewall of the tire. It is recommended that tires always be inflated to the max psi. The max psi of the tire will depend on the tire's load range, not the weight of the trailer. For instance, we carry 5.30-12…

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Answer 8

The typical tire should run about 158 degrees (Farenheidt) once you get going down the road, but this can vary greatly depending on the weight of the trailer, how fast you're traveling, and also driving habits. So while 158 is probably…

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Answer 9

We actually have the exact tire you are looking for. I recommend the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range D #AM10130 which will be an exact match for your current tires. If you are also needing a wheel I recommend the…

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Answer 10

The Spare Tire Carrier for Trailer with Angle-Iron Railing #e99045 will only fit 12" to 15" wheels so it will not work with your10" wheel. While there isn't another spare tire carrier for an angle-iron railing, there is a good…

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Answer 11

The 6-lug 15-inch trailer wheels we offer are all the 15 x 6-inch size; please see the linked page. This wheel size can accept tire sizes 205/75-15, 225/75-15 and 7.00-15LT. Our range of these tire sizes is shown on the other linked page. We have…

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Answer 12

We recommend that all trailer tires be inflated to the max psi stated on the sidewall of the tire. If the tire is under inflated, the weight capacity is lowered to an unknown amount for that tire. Although running lower air pressures can improve the…

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What Pressure Should Trailer Tire Rated at 80 PSI Max be Inflated to

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