Zipp 3ZERO MOTO B1 Wheel Rear 29'' / 622 Holes: 32 12mm TA 148mm Disc IS 6-bolt SRAM XD Silver Logo/Silver LineMoto Technologys single wall rim is the optimal approach for an enduro trail wheelset The 3ZERO rim can locally flex to stay parallel to the ground during cornering, increasing traction, providing higher impact resistance, reducing pinch flats, and reduced rider fatigue Frustration free tire installation German engineered hubset features 12 pawls and 132 points of engagement for quicker response and also has improved durability Lifetime Warranty SRAM