Seismic Alpha 75.5×62.5mm 76a-77a-78a

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

Available in two proprietary formulas

• • BlackOps™: ultimate balance of speed and grip
  • Extreme traction fresh
  • Buttery and smooth broken-in
  • Comfortable and predictable
  • Defcon™: 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.