Seismic Alpha 80.5mm LDP Defcon Longboard Wheels

Seismic Alpha 80.5mm x 55mm raises the performance standard of wheels dedicated to Long Distance Pushing with a series of unprecedented innovations. The tread profile features a 0.5mm concave that enhances pressure on the lips and increases grip. 6% offset core reinforced with fiber. Defcon urethane, extreme grip, Speed, and slow wear. Set of 4 wheels.

80.5mm tall x 55mm wide ALPHA Wheels
55mm running surface • Bearing seat offset 6% • Square outside edge, straight-cut inside edge
Defcon Formula™: Guinness WR speed • directional slide • long-lasting grip • slow, consistent wear

A giant step forward in race wheel engineering. The Alpha’s stout S-shaped edge profile optimizes lip support, maximizes traction under extreme G’s, and ensures predictable slide initiation and hookup. The running surface features a 0.5mm concave that pre-loads the edges, heightens rebound, and enhances in-slide feedback. The bearing seat is offset 6% for progressive lip engagement and more consistent wear.

The Alpha™ also marks the debut of Seismic’s proprietary Fusion™ core – at 46mm tall x 44mm wide, the largest and most supportive hub ever seen in a wheel this size. Features include a deep “saddle” profile, 8 perpendicular support beams (hollowed-out for lightness and aesthetics), and robust bearing lugs. The Fusion minimizes lateral wheel flex, supercharges edge support, and assures absolute mechanical lock with the urethane. Formed from 85D fiber-reinforced thermoplastic – the toughest hub material in the industry.