RUGGED PERFORMANCE Our go-kart tires use high-quality high-elasticity rubber, which is wearable and durable. The heavy-duty 4-layer nylon structure prevents puncture and abrasion and provides comprehensive protection for the kart to travel on any terrain. PERFECT COMBINATION Mounting Holes Diameter: 2.13"/54 mm; Fit: M8 bolts. This is a combination of a complete four-wheel drive kart tires, comprising two front wheels and two rear wheels. Tire size is 145/70-6, overall diameter is 13.4"(340 mm), wheel (rim) diameter is 6.7"(170 mm), section width is 6"(152 mm). UNIQUE TREAD PATTERN The unique tread design of the tread is to increase friction, increase the adhesion of the wheels to the ground.