I can't take credit for writing this one but I found it interesting A short guide to tire pressure Contact! firstly, the goal of tuning tire pressure is to gain as much of a contact patch as possible for a given situation and thus increase traction. therefore there is no set tire pressure for any type of driving, size of tire, etc. to find the best tire pressure takes trial and error, period. having said that, there is a ball park figure: 30-45psi. but that's 25% range! hardly exact science. so now we must assess what kind of driving your car is going to be doing. if it's just a daily driv