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Old 10-21-2015, 06:32 PM   #1
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Tire Presure

Good Day
I know this is an old topic but most of the forms talk about tire pressure at 50 and 60 PSI.
We are heading South to start our first full-time RV trip. We depart Canada on the 1st of November.
Went to check my tire pressure before traveling and the four of them come in low around 55 to 58 PSI. When I look at the tag from Jayco on the street side of the 5er it reads 80 PSI Cold. I note the the Towmax STR Powerking, ST 235/80 R16 state max PSI is 80.
Should I be filling my tires to the MAX 80 PSI???

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Old 10-21-2015, 06:36 PM   #2
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Fill to the max on oem tires.

The tire are sized for the load, and nothing more. Lower tire pressure, puts heat into the tire, which shortens their life.
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Old 10-21-2015, 07:23 PM   #3
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As you travel to warmer climates you will need to check and adjust the cold pressure. Keep a close idea on those Tow Max tires for any bulges.

They are supposed to be run at 80 psi.
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Old 10-22-2015, 08:19 AM   #4
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And as they heat up, the tire pressure will rise. They probably fluctuate as much as 5 psi or more due to temperature fluctuations. And as Norty1 said, keep and eye out for bulges. My towmax tires lasted for over 2 years and 10,000 miles and then two started separating on one trip. I wound up replacing all five(4 plus spare).
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Old 10-22-2015, 09:04 AM   #5
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Quote:
Originally Posted by Jagiven View Post
Fill to the max on oem tires.

The tire are sized for the load, and nothing more. Lower tire pressure, puts heat into the tire, which shortens their life.
X2
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Old 10-23-2015, 09:24 AM   #6
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Quote:
Originally Posted by namusmc65 View Post
And as they heat up, the tire pressure will rise. They probably fluctuate as much as 5 psi or more due to temperature fluctuations. And as Norty1 said, keep and eye out for bulges. My towmax tires lasted for over 2 years and 10,000 miles and then two started separating on one trip. I wound up replacing all five(4 plus spare).
+1. I'm in the process of replacing my TowMax tires with Maxxis M8008 (4 tires, I will leave the spare alone for now) I have tread separation on at least one tire. I caught it before it blew so I was lucky. I will always run my trailer tires at max sidewall cold pressure, and check pressure and measure temp on them frequently.

Good luck with your trip!

Edit: My Towmax lasted two years from purchase and about 3-4K miles. The Towmax have date codes very close to the manuf date of my trailer.
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Old 10-23-2015, 09:40 AM   #7
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I'll climb on my soapbox and shout the virtues of a tire pressure monitor.
After learning how much damage a failing tire can cause and how frequent ST tire failures seem to be (thank you JOF!!) I bought my monitor and haven't looked back.
I've had 2 epic tire failures (thank you Towmax!) and my monitor warned me of both before any damage to the trailer happened.
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Old 10-23-2015, 01:37 PM   #8
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I maintain tire pressures for everything to with 2 psi of manufacturers recommendations. Or, to what I see molded on the sidewall. Never over but, within 2 psi under the max.

Have never had a problem yet! Other than screws, nails and that sort of thing. 12 years of RV ownership and no issues.....yet. Perhaps the tire gods have been with me.
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Old 10-23-2015, 01:43 PM   #9
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I was looking back on the OP question about 50 psi. The reason 50 psi comes up alot is many TT's run 50 psi. 5ver are bigger and heavier so the tires need to be bigger and heavier too, which means more psi.
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Old 10-25-2015, 03:15 PM   #10
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What type of pressure monitor did you end up with??
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