Originally Posted by Hotrodz

It is all about how far you want to chase that rabbit down its hole. You can buy two piece light weight rotor and reduce unsprung weight even more to negate the weight of the tire. Depending on what you are looking for if you go with a smaller diameter tire like a 295 or a 315 it will effective have the same effect as changing your gear ratio and the car will accelerate faster in short runs which is what you want for tracking and canyon runs.