CRANKBROTHERs Crank Brothers Cobalt 2 Wheelset ENTHUSIAST LEVEL ALUMINUM WHEEL- Simple and beautiful, our unique, all aluminum, wheel design is based around principles of strength, stiffness and acceleration. LOW ROTATIONAL INERTIA  Unique wheel design distributes mass closer to the hub for faster acceleration and deceleration. TUBELESS READY  Hole-less rims: stronger and no rim tape required for tubeless setup. TWINPAIR SPOKE TECHNOLOGY  Designed using the strongest shape in construction, the triangle, to maximize strength and stiffness. BEAUTIFULLY SIMPLE  Single spoke length: easy to tune and replaceable without removing tire.