Tire - Battlecross X20 - Rear - 120/80-19 - 63M Battlecross X20 Tire Builds on the strong reputation created by X30 for medium terrain and X40 for hard terrain, the X20 brings all types of motocross riders, from championship competitors to young beginners, a new level of performance in soft conditions Developed on the race track with professional riders in top motocross competitions, the X20 features new Castle Block technology and a pattern layout proven to dramatically increase traction, cornering grip and the tire's working range Combined with Bridgestone's Castle Block, which unleash more edge effect and traction on firmer ground, the new X20 also gives riders more options across a wider range of terrain Redesigned block pattern with increased stiffness and edge component delivers stronger cornering grip and traction on muddy tracks, slippery sand and softer terrain