Shinko flat Track tires are designed and tested to perform at the highest level of the sport. The SR267/268 is available in three different compounds to give you the best tire for any track. Available in Soft - Medium - Hard compounds. Proven performance. DOT approved. Tire Specifications: Compound: Medium. Load / speed index: 71H. Recommended rim (inches): 3.5. Overall diameter (inches): 27.50. Overall width (inches): 7.50. Maximum load (pounds) / PSI: 761 @ 42 PSI. Construction: Tube type.