Spank 359 Vibrocore Rear Wheel - 29" 12 x 148mm Boost 6-Bolt HG 11 Black. Spank 359 Vibrocore rear wheel is World Cup DH developed and proven with internal vibration damping weight optimized for race. Unique profile enhances radial compliance and increased responsiveness and durability. Radial compliant design adds traction and reduces wheel deflection and negative feedback without compromise to strength or lateral stiffness. Vibrocore inner core reduces the transmission of vibration reducing rider fatigue and increasing rim fatigue life and torsional strength. 30.5mm inner width allows versatile tire fitting from 2.0 to 2.6 perfectly without negative squaring off of tire profiles.