I'm getting "tired" of this!

[mytoy944]

OK maybe I'm crazy but I notice that if I let my 98 sit in the garage for a week or so, then take it out for a spin, I have a thumping as if there is a flat spot on the tires. It lasts for maybe 2 to 3 miles, then seems to vanish. Funny thing is I notice the same on my 944.

Am I crazy (ok yes I'm crazy) or does this have to do with the soft compound tires on both these cars? I deal with "bling bling Subaru WRX zoom zoom ricers" all day long, (www.mspt.net , shameless plug) and have yet to hear anyone complain about this.

Is this just the nature of the beast? or what?

[ar38070]

Yes. You may want check your tire pressures. Even if they are okay you may want to pump them up 5# if you are going to let the car sit for a while. Just do not forget to reset the pressures when you take the car out.

[adsach]

The 18" Pirelli PZeros that came with my car would flat spot overnight - every night. 100 degree lows, 40 degrees lows they would flat spot.

My Yokohama ES100 will start to flat spot overnight when it gets below 20 - that is kindof my signal that it is time to go to the winter tires.

In a way flat spotting is a good thing - it reminds you that your tires are not yet up to operating temperature. Flat spotting is dependant on tire compound, tire size, ambient temperature and time. I think of it as a tire 'feature' rather than a tire 'problem'

[mytoy944]

Ahhh I see sort of like a warning system built in to the tire. hmmm good point! I have a new found respect for the thump thump thump......