Universal Standard for Tubeless. Traction and control. Ready to ride tubeless system. The UST concept improves traction, control and comfort while reducing inertia and flats. - No tube, no tape, fully sealed rim for convenient handling - Enables to ride at lower tire pressure - UST rim profile with specific humps to fix securely the tyre beads - Compatible with all types of tyres (UST, Tubeless ready, tubetype).