Vittoria Mezcal XC Race Tire - 29 x 2.25 Tubeless Folding Brown Graphene + Silica G2.0Vittoria Mezcal XC Race Tire 29 x 2. 25 Tubeless Folding Brown Graphene + Silica G2. 0. The Mezcal XC Race is built using a new XC Race Formulation and has been torture tested at the UCI elite levels. The Race Formulation employs Graphene and Silica providing increased wet grip and suppleness and combines a 60TPI tubeless ready casing to optimize deformation. This combination has been shown to reduce rider fatigue while simultaneously increasing race