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Old 09-16-2011, 01:43 PM   #1
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Tire Pressure Question

I have a 26BH with 205/75/15 Marathon tires on it. Each rated for 1820 lbs @ 50 psi. Total weight capacity of 7280 lbs. The actual CAT scale weight on these tires is 4880 lbs, so they are at approx 67% of capacity. Would you run these tires at 50 psi or would you run them at a lower psi rate? Would the outside temperature be a factor? Would you run them a different pressures at 100 degrees and at 60 degrees?
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Old 09-16-2011, 03:13 PM   #2
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I'll tell you what I do, and what I most often hear about trailer tire pressures. Inflate them to the maximum pressure as specified on the tire sidewall when the tires are cool, that is have not been driven on and have not been sitting in the sun for a long time. Once you set this pressure, don't bleed them down as the pressure builds up during the day.

The maximum pressure on mine is 65PSI; the actual pressures vary from 65 when starting out a driving day to as high as 75PSI when driving on a highway in the sun with outside temperature of 100 degrees or so. My TPMS is set to alarm if a pressure goes up to 77PSI, but his has not happened, so far.
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Old 09-16-2011, 03:19 PM   #3
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I would run them at 50 psi cold, that`s what I do with trailer loaded or empty.
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Old 09-16-2011, 11:42 PM   #4
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I always run the maximum stated on the sidewall.
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Old 09-17-2011, 02:01 PM   #5
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You can go to the tire manufactures web site and find the pressure rating for the weight you are carrying... just make sure if you are not running at max when you add something to the RV to increase tire pressure.
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Old 09-18-2011, 10:43 AM   #6
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The recomended tire pressure will be on the sticker at the left front corner of trailer. It is probably the max pressure of the tire and that is to be checked cold.
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Old 09-18-2011, 01:19 PM   #7
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I have always run my TT tires at the maximum recommended cold tire pressure, thinking it will enhance tire sidewall firmness even below maximum weight conditions.

Don't know if it's true, but have heard that maximum cold tire pressure on a multi axle trailer is a better condition when making turns.

Bob
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Old 09-18-2011, 04:00 PM   #8
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I run mine at max pressure as stated on the side wall as well. I do this year round.
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