The 85mm by 52mm Seismic Speed Vent is molded around our proprietary Energy Conversion (EC) hub the first tall, wide hub seen in longboarding and still second-to-none. The 85mm tire provides downhill roll speed, while the weight-saving hub adds the quickness and agility of a smaller wheel, as well as enhanced rebound. Combined with lips designed for pure grip, the Speed Vent stands in a class by itself. Features: 85mm tall x 52mm wide SPEED VENT Wheels Offset bearing seat 49mm running surface Radiused outside edge, chamfered inside edge 8.6 oz. each Guinness WR speed Directional slide Long-lasting grip Slow, consistent wear Sold in sets of Four wheels