Mach 1 Recommended Air psi ???

Discussion in 'Special Production' started by Ford Mach 1, Apr 15, 2013.


  1. Ford Mach 1

    Ford Mach 1 Member

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    Hello, I just bought a set of Nitto N555 in 275 40 ZR 17 on all 4 sides for my 03 Mach 1. I have a set of drag radials, so the Nittos will be my daily driver tires. What air pressure are memebers running in these tires for the street? For stock 245 40 17, the door panel says 30 psi , so wondering what I should run in the bigger Nittos, thanks!!! :shrug:
  2. cusp

    cusp Member

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    What I do is start at max weight and max pressure. Then determine actual weight in the tire. Divide actual weight by Max weight to get a ratio. Then multiply Max pressure by that ratio (less than 1) to get working pressure.

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