2004 Nissan 350Z tires problems

I was driving on the express way a motorcycle ahead of me applied his brakes I followed suit. The 350z roadster began to swerve and spin uncontrollably and stopped after I hit the sid rail resulting in motorcyclist and myself going to hospital the issues with the tires on the 350z are well known by consumers, nissan, and their dealerships. I have taken the car on at least three occasions to the dealership for examination and possible repairs but the tire defect and handling remain.

I purchased a 2004 nissan 350z in august of 2003. After about 24000 miles I complained of excessive road noise comming for the tires. I was informed by the dealer that the front tire were cupping and had to be replaced. This seems to be a known problem with this car and nissan acknowledged it on their 2003 model but continues to ignore it on their 2004 model claining that it has been addressed although they are not clear on how they addressed it.