The SS and SS+ feature an all-new tread pattern consisting of a smoother, diamond pattern center with more aggressive side lugs. * This tread pattern allows the rider to keep speed going into corners and maintain control throughout any transition a gravel ride could present. * The GravelKing SS incorporates a supple 126 TPI casing with a nylon puncture resistant belt and Panaracer U;A s proprietary ZSG (Zero Slip Grip) compound. * The SS+ uses the same build as the SS but adds a bead-to-bead layer of Panaracer U;A s ProTite puncture material for even more protection against tread and sidewall cuts for those extra demanding courses or rides with sharp flint rock.