Sumitomo Rubber has begun selling Dunlop Geomax Enduro EN91EX tires on March 15 for hard enduro competitions, which have been gaining momentum around the world in recent years. The product is available in one rear size (140/80-18 70M tube type: not for public road use). Based on the Geomax Enduri EN91, which has been well-received as an enduro competition tire,…