Posted for Bill Kennedy <bill_kennedy_3@hotmail.com>:

 
 The only adverse effect from running my 320 mains at 50 psi has been more
wear in the center treads. I still get lots of landings before the tires are
worn out. Sure beats fixing flats from the sidewall pinching.
 
 Lots of landings = 240 at last count (tires are pretty well worn out now).