The STI Mud Trax ATV tires feature an aggressive tread design with deep, angled, grooved lugs to achieve an exceptional level of traction. Extra tough 6-ply carcass utilizes an extended wear rubber compound for unmatched tire durability, tread-life, and load capacity. “V” shaped center lug provides a smooth ride. 25″ tires have 3/4″ tread depth and the 26″ and 27″ tires have 1 1/8″ tread depth. Please note : Tire sizes vary by machine please check your current tire and wheel size before ordering.