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Old 03-31-2015, 09:21 AM   #1
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Tire Pressure Question

I have the stock tires that came with my Shasta 27 RLSS they say max psi is 60 and I am running 50psi in each tire, first trip out this season locally and they seemed fine should I drop or raise the psi they are ST225/75/15
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Old 03-31-2015, 09:25 AM   #2
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What does it say on the side of your trailer, should be a sticker with tire size and pressure. You normally want to run St tires at there Max Pressure.
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Old 03-31-2015, 09:33 AM   #3
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Stickers lettering is very hard to read faded but so I should run all 4 at 60? That would be ok to do?
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Old 03-31-2015, 01:30 PM   #4
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If it was me I would run them at 60.
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Old 03-31-2015, 01:33 PM   #5
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Read the sidewall on the tire, if it is an LR D, 65# is max, so run 65#.
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Old 03-31-2015, 01:50 PM   #6
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If you are running low pressure it will decrease your mileage. So run the max (10 psi cost me about 2mpg)
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Old 03-31-2015, 03:39 PM   #7
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60 psi AT pressure is a strange value for American system .
C-load is always 50 psi and D-load always 65 psi.
European system has more exeptions .
So look again for C or D load or on one of the other tires for the right AT-pressure.
Most tire-makers even allow 10 psi above AT-pressure.
And ST tires are calculated in their maximum load for more deflection allowed at the lower maximum speed of 65 m/h.
but its better to give the tire a deflection that would be needed for 99m /h so the tires wont get that hot.
This gives more reserve and still no bumping.
Why use yust enaug pressure for the load , if you can have a confortable reserve.
And because most trailers are fitted with tires that can yust carry the gross axle weight rating together , the needed pressure comes mostly to the AT-presssure give on tie or belonging to the Loadkind.
10 psi higher would even be saver.
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