just wanted to say one thing about all these problems people say feathering /roaring etc. i went the other day to tirerack.com
and read reviews on these bridgestone tires and seems to be these tires really suck because it seems audi also uses them for original equipment the tire i am speaking about is 040 ...just wanted to share a view im not in no way a expert in this matter my z is only 1 month old track s.s. with 300 miles..my 2 cents

 

Many of us agree that Nissan made a VERY bad choice when choosing stock rubber. While the tires may be a contributing factor, since they're summer tires, when properly aligned, they should still wear evenly, so there's got to be more to it than just the tires--know what I mean?

Good luck with your Z--I truly hope that you do not get any feathering problems.

 

thanks racer i will see time will only tell if i will have a problem on my hands