I am running 36x12.5 super swamper tires. What is the optimum psi for maximum ON ROAD performance? Thank you.

 

chalk test!

because it depends on your average load. lots of tools/gear? frequent full passenger load? get a piece of chalk, draw lines across the treads, drive a bit, and see how your line wears.

it's usually easier to over inflate, then watch as you air down and the line gets scrubbed off more evenly across the tread. dig?

 

your a smart man I will try this. I almost never carry lots of tools and equipment, only holds me and one other person. Does anyone know the max psi for 36 super swampers?

 

Maximum (not recommended) pressure is usually on the sidewall

 

it also depends if they are bias or radial tires.

 

I have looked all over the sidewall and havent found the max psi

 

Should be there, it is required by DOT, but the Interco web site lists it as well:
- http://www.intercotire.com/tires.php?id=18&g=1

Some tips on selecting tire pressures below:
- http://www.4crawler.com/Diesel/Tires...roperInflation

I used to run my old Swampers at 30-35psi on long road trips (keeps the side lugs off the road) and then air down to 5-10psi off-road.