Today's road and gravel tires have evolved. Yesterday's slow-rolling 23mm tires and energy-robbing extreme air pressures have been replaced with wider faster and more comfortable tire designs. The Grail CB7 is the first rim built specifically around this new breed of tire. The Grail CB7 proves that smoother is faster by combining lateral stiffness with the soft riding feel. That special ride is about more than just comfort. Decreased resistance from road impacts and less shoulder and arm fatigue means more power to the pedals and a faster rolling wheelset.300g rim design optimized for tubeless tires and disc brakesRiACT rim shape and carbon lay-up absorbs vibrations to give you the best ride possible21.6mm internal rim width for more stability and control with all tiresTubeless ready with rim tape and valves installedPatented BST tubeless rim inflates easier and offers a more secure tire fitOptimized for lower pressure 25-40mm disc road gravel and cyclocross tiresIncludes 12mm end caps