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Old 04-12-2011, 10:13 PM
Mopar1973Man's Avatar
Mopar1973Man Mopar1973Man is offline
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Join Date: Nov 2010
Location: New Meadows, Idaho
Posts: 902
Default Tire Pressure Calculator

Well after playing around with Excel and doing some thinking. I figured out how to figure exactly how much air pressure you need in each tire. The thing is that you need to get your truck weighed on a truck scale. The calculator needs front axle and rear axle weights. Then you'll need the weight rating of your tire and maximum air pressure rating. Then you plug the information into the calculator (blue boxes) and it will figure out when your optimal tire pressure is. Since I just weighed my truck I left my figures in the boxes as samples...


Front Axle 4,420
Rear Axle 3,040


Front Axle 5,200
Rear Axle 6,084


Max Tire Weight 3,042
Max Air Pressure 80 PSI

Calculation (Axle Weight / 2) / Tire Max Weight x Tire Max PSI = Inflate Pressure

Front Axle = (4,420 / 2) = 2,210 / 3,042 = 0.72 x 80 = 58 PSI
Rear Axle = (3040 / 2) = 1,520 / 3,042 = 0.49 x 80 = 40 PSI

(Orignal article here with Excel file)
Michael Nelson - AKA: Mopar1973Man - Forum & Articles
2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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