Vee Challenge: VRB.321 The Challenge is for mountain motorbike path using or racing. Ramped and chisel formed heart and transition knobs set this tire except for the others. Diamond formed additional transition knobs supply nice cornering. The tire is built with Folding Bead (FB), Twin Compound (DC) and 120 Treads In keeping with Inch (TPI) casing subject material. Because the knobs supply awesome traction, we suggest this tire for basically for Medium ? Onerous (M)-(H) prerequisites however it may be used for plenty of trails.