For a long time, the innertube has been overlooked in the bicycle industry.</br> <b>Our vision:</b> Faster Trails, Safer Journeys. We created a premium innertube - street, trail or city - developed for the optimal cycling experience.</br></br> The Ultraverse pack contains <b>2 Inner Tubes and 2 Nylon Tire Levers.</b></br> Our standard tubes use a molded method of construction, ensuring a consistent thickness of butyl rubber. This offers more durability, better air tightness and longer lasting tubes.</br> The nylon plastic tire levers are different from the metal ones preventing excessive force, and not damaging alloy rims.</br></br> <b>Valve Type:</b> Schrader/ Auto Valve.</br> Doesn’t require a special pump to inflate in comparison to the Presta valve and are structurely designed for modern wider rims. Valve Length: 37mm</br></br> <b>How to Choose Your Size:</b></br> To determine the size you need to check the side wall markings on your tire where you’ll see two numbers separated by an <b>'X'</b>. The first number refers to the tire’s <b>diameter</b>. The second number refers to the tires <b>width</b>. Select the tube that has the exact same diameter as your tire. Your tires width should fall into the range of widths listed on the tube packaging.</br></br> <b>We offer the following sizes:</b></br> <b>16"X1.75-2.125</b>, suitable for Kids Bike, Foldable Bike, Bmx Bike</br> <b>18"X1.75-2.125</b>, suitable for BMX, Cruiser Bike</br> <b>20"X1.75-2.125</b>, suitable for BMX, Cruiser Bike, Mountain Bike</br> <b>24"X1.75-2.125</b>, suitable for Cruiser Bike, Mountain Bike</br> <b>26"X1.75-2.125</b>, suitable for Cruiser Bike, Mountain Bike