[jaykay]

I definitely have experienced flat spotting. Permanent? Well depends how long you want to spend ironing them out. The fronts are particularly sensitive after sitting a couple of couple weeks at regular tire pressures. Vibration can be felt through the wheel for quite some time after. What is this doing to your tires and steering linkage? Don't know, but I don't like it. Low profile 18>20s are particularly susceptible. What is the effect after 6 months sitting in one spot?

I still pump up to 50 psi all round for storage as was once recommended by Porsche. Not sure if that fell out of favour yet or this detracts from tire life. Way back, I also started rolling the car (or jacking) up on foam insulation pads (cut from sheets available at home depot and the like) such that it deforms rather than the tire. Later on I found out that this idea had come to others and been commercialized....

The 50 psi tire deforms the dense foam insulation and a moderate tire cradle effect is created. Something like carpet would not work. Every spring things are crystal smooth.

Overkill? Perhaps, but any vibrations coming up the through wheel is/are real feedback and my tires (street) tend to last until worn down to the bars. I am just really picky about front tire and steering feel and wish I could get more in this car. Perhaps this came from my motorcycle time....where spurious front wheel vibration is no bueno...