Its a strange one with both Perold & Dicky's statements, I'll share my experiences - I had a chat to my local stealers about a few issues yesterday and also mentioned the tyre feathering. I'm not sure what code of Bridgestones were on mine cos I've changed em now but the stealer did note that there was uneven wear on the fronts at the last service. They tried to say that there was nothing about any feathering issues with the 350z, I explained that there was a TSB about it and they went away to have a chat. Came back and asked me where I knew about it from cos they couldn't find it on Nissan computer, and I told them it didn't matter how I knew, if they weren't sure they could speak to Middlehurst in St Helens who knew about it (thanks everyone who's mentioned this before btw!), went away for another chat and then came back with a lot of info about something that they apparently knew nothing about (utter bo****ks that part then). They went on to explain that although it was a batch of tyres that were causing the problems on the affected cars there was also some "very very minor" adjustments that need to be made to the tracking but this would only be covered under warranty if the offending tyres were also sent back. So I'd say that if you've got some issues with feathering, or to be honest even if you haven't, it may well be worth getting a tracking check done anyway.