700c, 27-Inch & 650c

The Grand Prix 4-Season is a reliable companion for training rides and in competition, come rain or shine, featuring superior durability that's ready for any season. - Designed to wear longer and offer improved traction in harsh conditions and lower temperatures - Vectran Breaker is spun from liquid crystal-polymer to create a multiple-thread thermoplastic yarn. This partially crystalline fabric is more cut-resistant than aramid and its tensile strength is five times higher than that of steel. A Vectran Breaker is lighter, more flexible and effective against cuts than a comparable nylon breaker, without affecting rolling resistance - Duraskin provides a cut-resistant layer from bead to bead

The Ultra Sport II is a road tire built to Continental's exacting standards, providing you with the optimal blend of low weight, puncture resistance, and long life. It sports a strong, supple 180 thread-per-inch, 3-ply casing and is at home in all situations, from miles of training to amateur racing to all-day centuries.