Where the Grifo is a do it all tire, the Challenge Limus 33 Team Edition Cross Tubular Tire is a do it muddy tire. Its lugs are designed for maximum gripping surface area and are widely spaced to shed muck. Even the side knobs are designed for traction in deep mud, and they are reinforced laterally to improve cornering. Its 320TPI Corespun casing also helps allow the Limus grip in less than favorable conditions by effortlessly conforming to the ground. The Challenge Limus 33 Team Edition Tubular Cross Tire comes in a 700c x 33mm size with black tread and natural sidewall.