Feildoo 4 Pack Bike Tube 20 inch 1.75 2.125 Bike Inner Tube American Valves Mountain Road Bike Tire Tyre Butyl Rubber Inner Bicycle Tube Tire Accessories

Specifications: High quality mountain/road bike tire inner tube. Made of butyl, solid and durable, won't leak air. Make your bike more excellent. Item Name: Bike Tubes Material: Butyl Features: Thicken, Durable, Bike Accessories Size: 20 inch Package Including: 4 pcs x inner tube 4 pcs x Tire Levers Using Instruction: 1. Carefully remove the tires. 2. Remove the tire from the rim. 3. Remove the old inner tube. Check the tire wear. Find and eliminate any objects that may cause air leakage. 4. Insert the inner tube valve into the small hole of the steel rim and put it into the outer tube completely. 5. Assemble the tire on the rim be careful not to clamp the inner tube between the rim and tire lip or tool. 6. Make sure that the inner and outer tires and steel rims are properly installed, and then apply manual or foot operated inflator to slowly inflate. 7. Suitable degree of inflation Do not over inflate.