Tire Air Pressure - Page 2 - Fiberglass RV


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Old 07-02-2016, 01:59 PM   #15
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Name: Darral
Trailer: Scamp Standard 13' 2010
Tennessee
Posts: 1,443
Subtract my tongue weight and that would translate to apx 30 psi per tire on my trailer. Wow...My tires looks like the have the MUMPS at that pressure. No way Hosea! (I deflate to 25-30 lbs when the trailer is in storage and up on jacks).

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Originally Posted by Wayne Collins View Post
Running tires at max pressure will make for a bumpier ride.
Get a Load/Inflation chart for the tires
Weigh the trailer to know the actual load on each tire.
Air up accordingly.
Rule of Thumb: If you don't see any bulge in the sidewalls; if the tread is not contacting full width on the ground, you have too much air in them.
After running 50 or so miles at highway speeds, feel the tires. If just warm, you're OK. If hot, add air.

For example: from the LOAD/INFLATION chart:

ST185/80R13 = Max speed rating is 65 mph.
At 50 psi is good for 1480 lb per tire or 2960 axle load
at 45 psi ... 1400 psi, or 2800 axle load
at 40 psi ... 1300 lb
at 35 psi .... 1200 lb.
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Old 07-02-2016, 02:35 PM   #16
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Name: Jack L
Trailer: Bigfoot B-17 CB
Washington
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A word of caution here, Wheels also have a maximum pressure limit. Never exceed the lower number, be it tire or wheel,. I have always put the maximum allowable in any trailer I have used. Bumpy ride ?? Probably , but no one ever rides in the trailer so I'm not worried . If I had things coming apart in the trailer, that would be different.
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Old 07-02-2016, 11:51 PM   #17
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Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
IllAnnoy
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Has anyone here ever seen a wheel failure from overpressure on a passenger car or a light trailer?
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Old 07-03-2016, 01:01 PM   #18
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Name: Michael
Trailer: Li'l Hauley
Oklahoma
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I looked at an ST tire pressure/weight table. According to the guidelines, when my Lil Hauley is empty (or nearly so) I only need 15 PSI in my ST205/75/14 (75 MPH-rated) tires.
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Old 07-03-2016, 02:27 PM   #19
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Name: Darral
Trailer: Scamp Standard 13' 2010
Tennessee
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My point exactly Mike.

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Originally Posted by Mike Magee View Post
I looked at an ST tire pressure/weight table. According to the guidelines, when my Lil Hauley is empty (or nearly so) I only need 15 PSI in my ST205/75/14 (75 MPH-rated) tires.
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Old 07-09-2016, 08:15 PM   #20
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Name: Borden and Carole
Trailer: Boler 1978 17' 4" Earlton Ont Model
Ontario
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Some trailer tires say max 90 lbs others 50 lbs depends on size type and rating a, b, c; but the trailer door closet wall has a recommended pressure of 32 lbs for our trailer. That was with the original tires. Our special trailer radial tires with c rating did not exist from what I have learned in this club in 1978. 38 lbs seems to work well though with our loaded trailer.
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