Seismic Alpha BlackOps 75.5mm Longboard Wheels

Seismic Alpha 75.5mm raises the performance standards for longboard wheels dedicated to downhill longboarding with a series of unprecedented innovations. The tread profile features a 0.5mm concave that enhances lip pressure and increases grip. Reinforced offset core with 6% fiber reinforcement. BlackOp urethane provides a smoother and easier slide than the Defcon formula, making it an excellent wheel for fast freeride. Set of 4 wheels.

75.5mm tall x 62.5mm wide ALPHA Wheels
62.5mm running surface • Bearing seat offset 6% • Square outside edge, straight-cut inside edge
7.8 oz. each • Sold in sets of FOUR wheels
BlackOps Formula™: Fast and grippy, smooth slides once broken in.

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.