The front tyre HULKYBOY 90/100-21 is available in a universal hardness/rubber compound and is specially designed for Hard-Enduro. The name HULKYBOY stands for itself, as its incredibly wide running surface offers massive grip, especially on downhill runs.The tread is designed to clean itself even at low speeds, but the knobs are not too far apart to provide the grip of a trial tyre. The tyre plays by the F.I.M. rules. And it is suitable for almost any terrain.