NEW Improved Single- 15" Poly Wheel Tire Maximum air capacity 8 lbs psi Use hand pump or bicycle pump to inflate NOT FOR HIGHWAY USE Poly Wheel Tires: Nylon composite bolted rim assembly 6" X 6" diameter X 5/8" hole Poly Tire info written on tire 100 lbs weight capacity per tire 5mph max road speed/ if pulled with gold cart/bike/atv etc