Smaller in diameter and lighter in weight, the G27 is designed for the higher volume tires demanded by many riders on rougher and looser terrain. At 320 grams, Enve's lightest tubeless rim is 27mm wide and designed for tires marked 27.5 or 650B. Armed against pinch flats with the patent pending Wide Hookless Bead, the G27 is at home off-road and capable on tamer stretches of singletrack.