Sumitomo Rubber Industries Ltd. (TYO:5110) is planning an Oct. 1 launch for the Dunlop Geomax MX53, a motocross racing tire optimized for intermediate terrain. The lineup will include six sizes of front tire and 11 sizes of rear tire. Compared to the existing Geomax MX52, this new tire adopts a taller, thinner apex, making for more uniform rigidity in the…