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Check out if there is a max psi rating on the tire itself..
That should give you an idea of what to put.. not quite the max, but enough..

my guess would be something like 40psi
 

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depends on how hard or soft you want your ride. It also depends on the weather.

for a soft ride, you are good at 35 psi
for a little firmer ride, the way i like it...40 psi
 

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I have 235/40-18 Kumho's that I set at 36 psi all around. My rule of thumb is to set it at 10 psi less than the max pressure cold and 8 psi less if the tire is hot. Some may consider this a little high, but I'd rather sacrifice a little comfort for the added rim protection. Personal preference I guess.
 

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For my 18s, I set it at 38 all around. You really have to experiment on your own set of tires and suspension setup.
 

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it really depends on the ride quality. you can most likely find the max pressure for your tire and i usually put in 10% less than that pressure
 
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