Featuring an aggressive tread pattern, the Gravine XP is designed to improve performance and traction on rugged and muddy terrain. Its handmade construction is enhanced with Xtra Protection (XP), providing more endurance for rides on rougher terrains. Combining CORAZZA ARMOR GOLD and SILVER, this tire is ready to push the boundaries of gravel and take you on new adventures. With an increasing demand for robust gravel tires, Challenge continues to deliver cutting-edge technology for the most adventurous riders.