They are really great autocross tires and at like 20 psi will aslo net some impressive 60ft times. How long a tire last really does depend on how you drive i dont fly around corners and burnout at every stop. the shot is a 55 until i get off my but and go buy a timming light and buy some ngks. i got the whole car done for 750 and it required alot of body work. if anyone needs a good shop that will get shit done quick hit me up.