The Nuetech TUbliss® Core system is, essentially, a high pressure rim lock and seal that secures the entire tire bead to the rim, completely eliminating the use of a conventional tube. TUbliss® allows you to run a low tire pressure (as low as 10 psi) which dramatically improves traction; especially important for enduro and baja racing. Since there's no conventional tube, the days of pinched tubes and flats are over! Even if you get a tire puncture, the bead stays seated to the rim.