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Old 09-04-2011, 06:12 PM   #1
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Weighted today..Question

Got on scales today...STEER AXIL 7,300 lb (single)
DRIVE AXIL 12,840 lb (double)
GROSS WEIGHT 20,140 lb
My G.V.W.R. 22,000 .....OK thats looking good (we were 75% loaded on scales)
I've been at 95 psi cold....thinking I can drop down now to 85 psi (per information on driver door)
QUESTION....do I divide 7,300 X 2 and 12,140 X 4.....to get each tire load??
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Old 09-04-2011, 06:35 PM   #2
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Yes, for the charts I have used.
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Old 09-04-2011, 07:46 PM   #3
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Quote:
Originally Posted by GoldenBear View Post
Got on scales today...STEER AXIL 7,300 lb (single)
DRIVE AXIL 12,840 lb (double)
GROSS WEIGHT 20,140 lb
My G.V.W.R. 22,000 .....OK thats looking good (we were 75% loaded on scales)
I've been at 95 psi cold....thinking I can drop down now to 85 psi (per information on driver door)
QUESTION....do I divide 7,300 X 2 and 12,140 X 4.....to get each tire load??
GoldenBear: Yes and NO, not just becuase you've got a 700 lb. typo there, but because most tire pressure charts will de-rate the tires when used on the rear in a DUAL setup. Please read the charts carefully, But I think you'll find the rear axle weight (whichever is your actual) is divided by 2 because the charts are set up that way. If you divide the axle weight by 4, you may under-inflate those tires. It is not automatic that all 6 tires have the same pressure, but all tires on the same axle DO need the same pressure, as per the chart for your brand and model of tire.
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Old 09-04-2011, 08:23 PM   #4
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So on rear axle I divide 12,840 X 2 = 6,420.....when looking on chart my tire 245/70R19.5 (H) tops out 100 psi at 4,375, and I'm 6,420 (1/4 tank of gas and 15 gl's of water, now I'm corn-fused
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Old 09-04-2011, 08:28 PM   #5
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You should be looking at the weight/psi charts provided by the manufacturer of your tires. They are on their web sight.
What tires do you have??
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Old 09-04-2011, 08:39 PM   #6
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Michelin 245/70R19.5 H

Found Michelin tire chart.

It tell me at 3750 at 85 psi (single) and I'm 3650

6420 at 75 psi (dual) and I'm 6420
So 87 psi all around...thinking out loud
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Old 09-04-2011, 08:47 PM   #7
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Never heard of doing it that way. Get the four corner weights and use the heaviest one on each axle, (front and rear) then go to the charts. You will also notice the charts give that as minimum pressure for that load. It is best to add a fudge factor of #5-#10 psi as long as the max tire psi is not exceeded
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Old 09-04-2011, 08:50 PM   #8
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Quote:
Originally Posted by GoldenBear View Post
Michelin 245/70R19.5 H

Found Michelin tire chart.

It tell me at 3750 at 85 psi (single) and I'm 3650

6420 at 75 psi (dual) and I'm 6420
So 87 psi all around...thinking out loud
I'd run 90 front and 80 rear, that allows 5 psi for errors and leakdown between pressure checks. If you're reading the chart correctly, I didn't check that.
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Old 09-04-2011, 09:29 PM   #9
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Quote:
Originally Posted by GoldenBear View Post
Michelin 245/70R19.5 H

Found Michelin tire chart.

It tell me at 3750 at 85 psi (single) and I'm 3650

6420 at 75 psi (dual) and I'm 6420
So 87 psi all around...thinking out loud
GB: If you are SURE your tires have the "H" rating (120 psi max pressure on the sidewalls), then it seems to me you have figured it out correctly, except I agree with the advice given by Mr._D to use + 5 lbs for added saftey. Since your tires can handle up to 120 psi, I would have no reservations running them at 90psi frt and at least 80 in all four rear tires. I think you will notice the firmer ride up front (for each increase in pressure) but not so much for the rears, so you may run them a little harder than the "chart +5" pressure and still not feel it.

I don't understand your desire to run all 6 at the same pressure, and would not go that route myself.
Safe travels!
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Old 09-04-2011, 09:53 PM   #10
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245/70R19.5 XRV LRF
80 psi for 7280 single and 13660 for dual
85 psi for 7480 single and 14060 for dual
90 psi for 7780 single and 14620 for dual
95 psi for 8160 single and 15440 for dual

So looks like you should be 85 psi +5 for fronts and 80psi + 5 for rears.I always add + 5 psi for safety reasons.
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Old 09-04-2011, 10:06 PM   #11
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I like ther others are saying would prefer to error on the side of more pressure.
More pressure = harsher ride.
Less pressure = softer ride....till a tire fails, then it it real soft.
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