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Old 01-12-2010, 10:06 PM   #1
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Question Tire pressures for new radials

I just installed 225 X 75 X 15 ST Tow Master tires on my 22 Argosy
(3360 lbs empty and maybe 4000 loaded). I wonder what the pressure should be set at. The manual calls for 40 psi on 700 X 15 bias ply, dealer I bought it from said 50 psi for most trailer tires. The Goodyear dealer tech put them at 65, (their max pressure) (so I reduced to 50, feeling to much since they stood up straight, no radial bulge).

Any ideas or tecnical specs on replacement tires?
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Old 01-12-2010, 10:55 PM   #2
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The dealers always overinflate to be sure and seat the beads especially on old rims.

I like your 50psi. The Goodyear or Michelin web sites have inflation for load charts. Haven't looked at one for quite a while but, I have no concern that you are safe at 50psi.
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Old 01-13-2010, 09:52 AM   #3
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Quote:
Originally Posted by arcamedies View Post
I just installed 225 X 75 X 15 ST Tow Master tires on my 22 Argosy
(3360 lbs empty and maybe 4000 loaded). I wonder what the pressure should be set at. The manual calls for 40 psi on 700 X 15 bias ply, dealer I bought it from said 50 psi for most trailer tires. The Goodyear dealer tech put them at 65, (their max pressure) (so I reduced to 50, feeling to much since they stood up straight, no radial bulge).

Any ideas or tecnical specs on replacement tires?
Find the inflation vs load chart. Goodyear (I know a four letter word) has them on line. My trailer weight can be 7,100 to 10,000 lbs. I inflate accordingly. I have been running around 9,000 lbs so I am running close to the upper end of inflation pressures.
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Old 01-13-2010, 11:20 AM   #4
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on a trailer, run tires at max sidewall pressure.
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Old 01-13-2010, 11:25 AM   #5
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Any ideas or tecnical specs on replacement tires?
Here is the load/inflation chart from Goodyear. http://www.goodyear.com/rv/pdf/rv_inflation.pdf.
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Old 01-13-2010, 12:44 PM   #6
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You did not specify what load range your tires are. Load range D tires are generally 65 lbs. pressue max load and the max load the tire will carry is specified on the tire side wall. So do the math add up what the max load the tires will carry vs. what your rig weighs. Obviously running the tires at max pressure will definetely be more than what you need with a wide margin but will create a harsher ride because the tire sidewall cannot do not flex as much. So if you go to the charts and come up with a pressure that will handle the weight of your rig plus a safety margin of about 10 % you should have a safe rig, get good tire wear and a nice ride.
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Old 03-11-2010, 02:19 PM   #7
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OK, here is a basic math question: what rig weighs divided by four (tires)? This gives you the load per tire? Then adjust tire pressure accordingly? Thanks. Jack
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