Also MAKE SURE YOU HAVE A GOOD AIR PRESSURE GUAGE!!!
I cannot stress this enough.
When I worked at Ukranian Tire years ago, i acquired 2 guages, the one was eaier to read, so i held onto it for most times, but only went up to 50psi. The othe rone didn't have the finer measurements, but went up to about 80psi so I used that one only for the spare.
Shortly after we got the focus I went to check the pressures. All of them were showing about 5-7psi too low...so I topped them up. The ride ws pretty harsh, but considering I've never owned an economy car with 50 profile tires, I assumed this was normal.
A short while later i went to check my tires on the Corolla. Sure enough, jsut as I was seating the guage on the valve, the head of the pressure guage simply snapped off the end! At this point I went to use my other guage that went up to 80psi, jsut to realize that I had my tires over-inflatted by about 10psi!!! I was running at almost the extreme pressure designed for that tire and could have almost suffered a blowout had the ambient temps gotten too warm outside.