The BATTLECROSS X31 is for a broader range of intermediate terrain in big bike sizes. Starting where the X30 left off, the X31 is enhanced with Bunker Groove™ technology which results in greater traction in both harder and softer terrains. Bunker Groove™ works by improving casing flex which enhances traction in harder terrain and adds biting edges for traction in softer conditions. Cooling Fins™ keep the feel consistent throughout your moto