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 core, making it astoundingly light for a wheel of this size - so much so that we expect top racers to use it for disciplines ranging from Tight Slalom all the way to technical Downhill. Truly a "blast" to ride, and destined to rewrite the book on the versatility of tall wheels.According to one of the leading figures in the Colorado racing scene, "they grip as much as I want while pumping and hard carving. When I push them to slide, they break extremely smoothly (with none of the annoying chatter or hop associated with big balls of urethane), and they hook back up like butter."Clear Orange - 75aClear Blue - 79aPurple - 83a