For fat bike riding, racing and adventuring. First fat bike rim to feature genuine NoTubes' tubeless technology with innovative raised center rim profile for tubeless use. Rim width: 53.1mm external and 49.9mm internal for maximum tire volume and flotation. Compatible with plus+ and fat clincher tires when used with 27mm Yellow Tape, 35mm Valve Stem, and NoTubes Sealant.