The AT81EX Endurocross tires offer more all-around performance plus higher levels of ruggedness for off-road racing and riding. Exceptional performance and high-durability compound resists block chunking and tearing. Shoulder knobs with lateral grooves provide additional biting edges and allow for more flexibility and impact absorption with enhanced puncture and cut resistance. The EX was developed for use in Endurocross racing and has a unique “gummy” compound giving exceptional grip in extreme conditions.