Geomax AT81 EX Rear TireRear tread block shape and distribution plus flexible knobs help the tire penetrate down through the surface dirt for extra traction across a broad range of off-road applicationsDeveloped for use in Endurocross racing and has a unique "gummy" compound, giving exceptional grip in extreme conditionsEndurocross tires offer more all-around performance plus higher levels of ruggedness for off-road racing and riding"Plush pad" recess design between tread blocks enhances compliance for bump absorption and rider comfortLateral grooves on shoulder knobs provide additional biting edges and allow the knobs to be more flexibleRear center blocks are arranged in-line to provide a larger contact patch for maximum tractionHigh wear-resistance tire compound offers enhance chipping, tearing and wear resistanceRear tire carcass features two nylon pliesM-rated for speeds up to 81 mph