Beware of running the pressure too low on the street, especially on the front. The natural tilt of the tire/wheel when turning puts more pressure on the lugs on the edges of the tires during sharp turns. This is what wears the tread to make them look like a saw blade, instead of the square that they were made to be. Wider wheels (greater off-set) exaggerate this problem. You need to run just enough pressure to ride to the center tread, slightly holding the edges off of the pavement (when the wheels are straight). The rear can take less, first because it is not carrying as much weight (unladen) and second because they stand straight all of the time. Just remember to adjust the pressure when you rotate the tires.
Another thing that will make them last longer, ride better....and be quieter is to have them "trued". There is usually a "big tire" store in major cities that can do this. You may be surprised at how out-of-round these tires can be.
They are far easier to balance after this too.
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