Stan's Yellow Rim Tape is designed to work with tubeless-ready wheels. It creates a durable, airtight seal over spoke holes while the completely non-porous vapor barrier seals rim interior from moisture. Natural gum rubber adhesive sticks where and when you want it to but leaves no residue. For inflated tires to 45psi or less, one layer of yellow tape over the spoke holes of your rim is all you need. For road tubeless and similar tires that require more than 45psi of pressure, a double wrap of tape is required. Stan's 21mm Rim Tape is recommended for rims with an internal width of 19-21mm.