S&M BMX Tube 20 x 2.10 to 2.50. These work on most all BMX tires like 20 x 1.75 to 2.50. Be careful when pumping your high pressure tires. Make sure the tire bead is even around the rim. Put a little air in your tube to prevent twisting of the tube. Check the inner tire for any sharp objects that may have penetrated the tire. You can slowly run your finger along the inner tire to check for objects that can puncture your new tube. If you install your own tires and tubes you are responsible for any issues that may occur.