Dunlop Geomax MX52 Rear Tire (120/80-19) The Geomax MX52 is derived from top-level AMA Supercross and Motocross racing. New Dunlop-patented block-within-a-block knobs offer more progressive cornering action. Enhanced handling and knob durability via more flex, and less knob tearing through recess carcass design. Superior bump absorption through new damping control sidewall rubber compound and recess carcass design. Superior grip in a wider variety of terrain.