What is the basic difference between a drag kit and a pro street kit?
Drag kits use solid steel rotors (or optional drilled rotors) and yield high brake torque, yet are very lightweight. They are engineered to the absolute minimum in rotating and un-sprung weight, where all that is required is a single stop at the end of a drag run. The lightweight steel rotor is not designed to absorb and release the heat generated when driving in normal traffic, and will warp quickly when used on the street. Pro street kits use cast iron rotors that are .810″ thick, weighing 7.9-lbs. Their vented design and cast iron material allows them absorb and release the heat generated when driving in normal traffic. These kits offer a substantial weight savings over factory disc brakes due to use of aluminum hubs, rotor adapters, calipers, and brackets, while the vented cast iron rotors offer long term durability for street use.
