What technology does it use in its construction? The Dirty Dan is available in a choice of casings. Super Gravity for the aggressive riders that rely on the compliance, stability and robustness of a Downhill tyre without the weight penalty, or the Super Downhill casing for uncomprimised control, stabilty and puncture priotection whilst racing on the limit. Both casings come standard with the Addix Ultrasoft compound for sensational grip and damping.What is the intended use? Designed purely as an all out racing spike tyre, the Dirty Dan provides the pinnacle of traction and protection in extreme conditions. The aggressive sharp square edged knobs are widely spaced enabling dirt to clear freely whilst digging in to the deep, soft terrain below.Our verdict An essential tyre to provide grip and stability in conditions you thought were unrideable, the upper hand against your competitors when conditions cannot get any worse.