Check the listing for details. GRAINGER APPROVED 1NXB9 Solid Wheel,8"dia,250lb,8x2.5 1NXB9. Condition: New. Listed at 17.23 USD. Solid Wheel, 250 lb Load Rating, Ribbed Tread, 8 in Wheel Dia., 3 7/8 in Wheel Width, For Axle Size 3/4 in, 8x2.5, Standard Tire Rim Type, Center Mount Hub Position, 2 3/4 in Hub Length, Steel Hub Material, No Non-Marking Flat-free solid rubber wheels can withstand heavier loads than pneumatic, semipneumatic, or flat-free polyurethane foam wheels, and they provide more shock absorption than semipneumatic wheels. They absorb shock and vibration for a cushioned ride and will not go flat if punctured, making them suitable for rolling over rough or uneven terrain in areas that may contain nails, metal shavings, rocks, or other sharp debris. The wheels have a hard rubber core and are heavier than pneumatic, semipneumatic, and flat-free polyurethane foam wheels.Pneumatic, semipneumatic, and flat.