Yokohama Rubber Co. Ltd. (TYO:5101) on Dec. 5 launched Japanese sales of BluEarth-air EF21, a new tire incorporating the latest in design technique for lightweighting and reduction of environmental impact. Sales have been limited to 100 units with a single size of 205/55R16 91V. Adopting Yokohama Rubber’s latest design technique to achieve a lighter tire and conserve resources, the BluEarth-air…