The superfast rs 39racesport39 version is a genuine race tyre with greater puncture protection than the previous supersonic model yet without any significant weight penalty a serious option for xc racers the black chili compound works its wonders on fast paced technical world cup tracks and marathon trails now considered a legendary tyre the race king heralded the advent of the current continental mtb tyre range irina kalentieva won two world championships on race king tyres as well