Wheels SEISMIC Alpha 80.5mm 74A Plum Defcon

The Seismic Alpha 80.5mm 74A Plum Defcon Wheels are designed for high-performance racing, offering extreme traction, predictable slides, and powerful braking. Their 80.5mm diameter and 60mm width deliver exceptional roll speed and momentum, while the 60.5mm running surface ensures smooth handling through the hardest corners. Formulated with Seismic’s Defcon™ ultra-high-rebound urethane, these wheels provide Guinness World Record speed, superior grip, and slow, consistent wear. The 74A Plum durometer, an Aaron Hampshire pro signature wheel, offers a plush, velvety roll with extra edge hold, making it ideal for racing on rough roads while maintaining aggressive yet smooth slides with faster braking. Built around Seismic’s Fusion™ core, the largest and most supportive hub ever used in a wheel of this size, these wheels enhance edge support, maximize energy return, and optimize slide control. The bearing seat, offset by 3.5%, ensures progressive lip engagement and consistent wear, while the square outside edge and straight-cut inside edge provide maximum grip and controlled slide initiation. Specifications : Size : 80.5mm x 60mm Color : Plum Durometer : 74A Formula : Defcon™ (Guinness WR speed, ultra-high rebound) Running surface : 60.5mm Bearing seat : Offset 3.5% (for progressive lip engagement) Profile : Square outside edge, straight-cut inside edge Core : Fusion™ (46mm x 44mm fiber-reinforced thermoplastic) Weight : 9.125 oz per wheel Sold as : Set of four wheels Designed for racers who demand elite-level traction, smooth sliding, and powerful braking, the Seismic Alpha 80.5mm 74A Plum Defcon Wheels provide unrivaled speed, grip, and control for high-speed downhill and technical racing.