Cyclocross World Champion for years. Whether a Pro or just a hard core rider Grifo is the tire you need. Unbelievable grip with no rolling resistance compromize. The original Challenge tread and a perennial World Championship winner, the Grifo has been updated with a more supple 300 TPI casing in the UCI legal maximum width of 33mmCasing change helps to increase grip, comfort for the rider, and tire volume. Tread pattern is the best all rounder, with great grip but no loss in terms of low rolling resistance designed for almost all course conditions other than extremes.