The GravelKing X1 R LINE is the latest addition to the GravelKing family, and it is definitely a tire for maximum performance. Designed to be the fastest tire on the track, it encompasses all the features you expect from Panaracer. It features an aggressive yet fast tread pattern and superior self-cleaning in muddy conditions. This tread pattern is a tribute to the 10th anniversary of the GravelKing and to the many cyclists around the world who have lived countless adventures and experiences with Panaracer. The rubber compound boasts a specific gravel material formulation, starting with Panaracer's patented ZSG (Zero Slip Grip) material. ZSG ensures excellent resistance to temperature and weather conditions and offers low rolling resistance and consistent grip across a wide range of temperatures, from near freezing to scorching heat. TuffTex is a revolutionary structure developed exclusively for GravelKing tires. The Race-Line uses a TeffTex-R casing that is more flexible than the standard version and allows for incredible weight savings, while maintaining the DNA that is the essence of every Panaracer Gravel King tire. BeadLock: The tire bead fits various rims (including hookless ones) and in most cases can be mounted with a standard floor pump. Panaracer GravelKing tires are manufactured in Japan by experienced technicians using the most advanced materials. This ensures exceptional production quality and performance. Note: For installation, Tubeless Ready tires require tubeless-compatible rims/wheels, tubeless valves, tubeless rim tape, and sealant. Puncture sealant is not necessary for UST Tubeless tires, but is recommended for increased puncture protection. Installing Tubeless tires is not always easy and should only be performed by qualified personnel.