I just raised mine from about 32 to 38 on my 20's (stock rims). Whats the sweet spot?

 

Door sticker will tell you.....

 

My door sticker says 35, but I typically run 37 to 38. I tried 40 but it makes the ride too stiff. My truck has 275/60s on factory 20s.

 

Incorrect air pressure will ruin your tires, always go by door sticker, never by how the tire looks flat because of side bulge. pressure too low will wear outside edges and cauase tire to overheat, which may lead to tread separation. Pressure too high will ride hard and wear middle, and weaken the cords inside the tire

 

Door sticker does not know what tires you currently run. It all depends on the manufacturers specs for your specific tire.