The R utilizes a completely new casing technology, making it the fastest and smoothest Gravelking tire ever. Tubeless Ready up to 60 PSI. Details: - Compound: Bead-to-bead protection with our smoothest and lightest casing yet. This distinctive combination ensures an exceptionally smooth ride and offers the lowest rolling resistance possible for a GravelKing tire. - Ideal for gravel, mud, and rough asphalt - Available in black tread and brown sidewall - Foldable (Aramid) bead - Available in 700C and a variety of widths - TLR and Hookless compatible - Max. pressure: 80 PSI (tubed); 60 PSI (tubeless) - Weight: 390g (700x35c); 460g (700x40c); 510g (700x45c).