That’s where TUbliss tire inserts come in. Technically, these aren’t tubeless, as they each use a small, bicycle-sized inner tube. Rather than filling the inner volume of the tire, however, this tube puts pressure on a red rubber liner that pushes the tire beads against the rim. The small tube is inflated to 100 psi via a standard Schrader valve, while the tire is inflated through a second Schrader valve incorporated into the red rubber liner’s bead lock. On some rims this requires drilling out the hole from 8mm to 10mm.