Stan's: Our tape is air tight and non-pourous, super thin and will not affect tire fit, and does not leave a messy residue when it needs to be replaced. Stan's 30mm Rim Tape is recommended for rims with an internal width of 28-30mm. Stan's 33mm Rim Tape is recommended for rims with an internal width of 31-33mm. Stan's 36mm Rim Tape is recommended for rims with an internal width of 34-36mm. Stan's 39mm Rim Tape is recommended for rims with an internal width of 37-39mm. When running less than 45psi a single wrap of tape is neccasary, when running greater than 45psi a double wrap of tap is required. Please note that Stan's Yellow Rim Tape by itself is not a tubeless conversion. Traditional (Non-BST) rims require the use of a Stan’s NoTubes rim strip to achieve a secure tubeless setup. Using only Yellow Rim Tape and Stan’s NoTubes sealant on a conventional rim can result in difficult inflation, and catastrophic "burping" issues.