Seismic Blast Wave Wheels 78mm x 50mm 78.5A set of 4. Offset bearing seat, 47mm running surface, Radiused outside edge, beveled inside edge. A favorite among elite LDP riders worldwide for its speed and acceleration. The Seismic Blast Wave is 78mm tall by 50mm wide, with a radiused outer lip for high grip with controlled sliding. It’s molded around the full version of our proprietary Energy Conversion (EC) hub - the first tall, wide hub seen in longboarding and still second-to-none. Astoundingly light, responsive, and versatile for a wheel of this size.