Features:.Creates a durable airtight seal over the spoke holes.The completely non-porous steam barrier seals the inside of the rim from moisture.The natural gum adhesive adheres wherever and whenever you want but leaves no residue.The low friction surface helps the tire heels slide in place MEASURES:Stan´s 21 mm rim bottom is recommended for rims with an internal width of 19-21 mm.WHAT YOU NEED TO KNOW:Stan´s yellow tape is designed to work with ready-to-use tires and wheels without a camera.If you´re inflating your tires at 45 psi or less, a layer of yellow tape at the base of your tire is all you need for most tires.For cameraless and similar road tires requiring more than 45 psi of pressure, a double lap of tape is required.WHAT IF I HAVE AN OLDER TIRE? The BST (Bead Socket Technology) profile developed by NoTubes de S..