Vittoria Martello Tire – 27.5 x 2.4 Tubeless Folding Black Anthracite Trail 4C TNT G2.0. Martello hammers home the performance you expect on the most demanding Enduro and DH courses. Looking for the one tire to tackle a wide range of courses? The Martello features a World Championship proven TNT bead add the proprietary 4C Graphene compound topped off with a moto-inspired tread design and progressive width siping. This last part is key and provides for a progressive feel on the effective edge allowing for that fine-touch tactile feel that top racers expect. This design provides for a progressive feel on the effective edge allowing for that fine-touch tactile feel that riders expect. Whether shredding rocks roots or mixed terrain Martello delivers.