Product Specifications: 1.75/1.95/2.10/2.125 inch Bicycle inner tubes are the widest range of sizes on the market, butyl rubber inner tubes fits most road and mountain bikes, are great replacements for broken tubes. Note: Please check your tire size before purchasing.High Quality: Mountain bike inner tubes are made of high quality rubber material, which have good sealing performance and stable tire pressure, and have the characteristics of aging and shock absorption.Durable and Comfortable: The road bike inner tubes are more durable, with good toughness, can withstand the toughest terrain, and are resistant to punctures and tears. Easy to Install: Bicycle tube with 2 tire levers, installation operation is very simple and quick, saving time and effort, you can replace the old inner tubes in minutes, the tire levers can help install the tire over bike tube without scratching either the rim and the tube. Important Tips: Please inflate a small amount of air before you are ready to install until the inner tube is round, by the way check if there is any air leakage You can shape it that it does not twist into a ball and make it flat. Finally, check whether the inner of the tire is flat. Specification: Material: RubberSize:26 x 1.75/2.125 inch24 x 1.75/2.125 inch22 x 1.75/2.125 inch20 x 1.75/2.125 inch18 x 1.75/2.125 inch16 x 1.75/2.125 inch14 x 1.75/2.125 inch12 x 1.75/2.125 inch Package Includes: 2 Bike Inner Tubes2 Tire Levers Note: Please allow slightly errors due to manual measurement and different monitors.