KAROO EXTREME DESERT 90/90-21 M/C 54R MST TT FThe design and layout of the knobs and the overall structure provides extreme traction on the most difficult terrains of the most demanding off road rallies KAROO Extreme combines both natural rubber for mechanical resistance and synthetic rubber for wear and knob tearing resistance High percentage of carbon black in the compound increases resistance to stress, even at high temperature Improved overall flexibility of the structure provides excellent