Psom recalibration (new tires)

[C_Luft]

Its been a long while sinceI have been on but I must ask is there a guide/ chart to calculate what I need for my new tires. They are 285/75 r16 and I know some of you are on facebook idi diesel owners, so you may have seen my new truck. 1994 f350 centurion package (not classic)
4x4 turbo diesel k code, 73500 miles, auto.
My new revolutions per mile are 633
Old was 655. Im sorry for asking specifics, not a lot of patience after working 13hrs and have been up for 25 hours.

Thanks

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[79jasper]

Tires pressure can affect rev per mile.
You should chalk the tire and measure the actually rollout.

See if this helps you. http://www.supermotors.net/registry/media/76023

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