My Iroc R/T has stock 16 x 6 Ninja Wheels with 205/55/16 tires on them. i found either 225/50/16 or 215/45/16 and the possible 255/50/16. which is fit best for some street racing/possible drag strip passes on a car with Konis and Eibachs on my stock wheels. Also if they wont fit please tell me why