2PCS 4.80/4.00-8 Inner Tubes Made of high quality and heavy duty rubber, these inner tubes are very durable and ideal for home, professional and commercial, industrial use. Compatible Models for Reference 4.80/4.00-8 Tire. 15.5 Tire Diameter for 15.5 Pneumatic Tires/Wheels - Perfect for hand trucks, carts, lawn mowers, wheelbarrows, generators, utility carts with 16 wheels. Fits 8 inch rim. /WHEELS: Replacement inner tubes for 4.80/4.00-8 tires/wheels (15.5 outer diameter). Also measured in 4, 80 4.00-8, 4.8 4.0-8, 480/400-8, 4.80-8, 4.8-4 -8, 480400-8, 4.8/4.0-8, 4.00/4.80, 4.80-4.00-8 inches Note: MAX INFLATION 30 PSI. Inflate with a hand pump only to avoid over-inflation. Not designed for road or highway use. Universal causes of tire and tube failure: A single puncture or small hole is usually the result of a thorn, wire or small nail. These may be repairable. Also check the tire for thorns etc. and then remove. Double splits are usually the result of a pinched rim. Tube pinched between rim and object on road/trail. Increase air pressure or use wider tires. Rash causing a large jagged hole. These are usually not repairable. Also check for damage to tires and rims. A cut or tear for a long time can also indicate a tire blowout. Typically not repairable. Be careful when entering a tire during installation. Inspect Before Installation Inspect the outside of the tread for nails, glass, thorns, or other protruding objects. Visually inspect the inside of the tire casing for nails, glass, or debris. Wipe the inside of the casing with a rag, then carefully feel the inside with your fingers. Be careful if using a tire lever. The tire lever is very easy to puncture a hole in your tube. Inspect both sides of the tire for bead seating and for any signs of tube popping out. Reinstall if necessary. How to inspect the hole in the tube? Inspect for air leaks by holding the tube near the sensitive skin of your lips or near your ear. Move the tube around its circumference. If these steps don't work, push the tube into the water and watch for bubbles in the hole.