The R6 has been specifically engineered for Autocross applications. An ultra-high cold torque compound delivering consistent performance from dead cold (0F) up to 1000F+ (0C to 537C+). The advanced compound matrix provides an excellent initial bite, high coefficient of friction at lower temperatures along with very progressive brake modulation and release characteristics. The R6 compound is widely used for street use as well, but this compound will more than likely make noise on the street. G-LOC doesnt recommend street driving on with R6 due to possible elevated levels of dust and noise. R6 is NOT recommended for road racing (closed circuit) use in most applications.