WTB Vulpine S Tire - 700 x 40, TCS Tubeless, Folding, Black/Tan, Light/Fast Rolling, Dual DNA, SGVulpine S is the gravel revamp of a proven semi slick mountain tread with years of swift efficiency under its belt. The slick centerline decreases rolling resistance while its round tire profile is packed with short, tightly spaced knobs to provide predictable cornering traction on hardpack terrain. The Vulpine S is the fastest tire made by WTB. SG provides an extra layer for sidewall protection and increased air retention in high pressure tires