Seismic Alpha 80.5mm 74a Defcon Wheels - Plum (Set of 4)

Seismic Alpha Wheels 80.5mm tall. Optimal balance of momentum, efficiency, and grip for pushing and pumping speeds! A highly-optimized balance of properties for modern racing. The fastest urethane that the skateboard industry has ever seen, bar none. The largest and most supportive hub ever seen in a wheel this size. Size and momentum to carry you past the competition in straightaways, yet agile enough for quick acceleration, fast edge-to-edge adjustments, and snappy technical pre-drifts. Available in DEFCON ultra-high-rebound formula. Vice-like grip and very snappy directional slide, with plenty of slowdown power. Ideal for aggressive racing.

A highly-optimized balance of properties for modern racing

• Size and momentum to carry you past the competition in straightaways – yet agile enough for quick acceleration, fast edge-to-edge adjustments, and snappy technical pre-drifts. Welcome to a whole new realm of FAST!
• Finely-calibrated width and supremely supported edges for smooth, predictable handling through even the hardest corners.
• The very fastest urethane that the skateboard industry has ever seen, bar none.
• Named after the Greek letter “alpha” (α), used in science to represent rotational acceleration.

A giant step forward in race wheel engineering

• Stout S-shaped edge profile optimizes lip support, maximizes traction under extreme G’s, and ensures predictable slide initiation and hookup.
• Running surface features a 0.5mm concave that pre-loads edges, heightens rebound, and enhances in-slide feedback.
• Bearing seat offset 3.5% – 6.5% for progressive lip engagement and more consistent wear.

The Fusion core – integrating 15 years of advanced hub R&D

• 46mm tall x 44mm wide – the largest and most supportive hub ever seen in a wheel this size.
• Deep, wide “saddle” profile regulates lateral wheel flex, supercharges edge support, and ensures absolute mechanical lock with the urethane.
• 8 lateral support beams (hollowed-out for lightness and aesthetics) form wide ridges that create unprecedented circumferential lock and rebound.
• Robust bearing lugs.
• Formed from 85D fiber-reinforced thermoplastic – the toughest hub material in the industry.

Available in DEFCON ultra-high-rebound formula, in three finely-tuned durometer choices

Thoroughbred race ‘thane • Guinness WR speed • directional slide • long-lasting grip • slow, consistent wear

• 74A Plum (Aaron Hampshire pro signature wheel): Plush, velvety roll with extra edge hold, even on rough roads. Aggressive yet smooth slide with faster braking.
• 76A Mango: Vice-like grip and very snappy directional slide, with plenty of slowdown power. Ideal for aggressive racing.
• 78A Mint: Very stiff edges that give loads of grip with a friendly slide and crisp hookup. Ideal for smooth roads and lighter riders.

Available in finely-tuned widths:

• 80.5mm tall x 61mm wide DH Race
• Superior top-end roll speed, traction, and braking power… with surprising quickness and agility for a wheel of this heft!
• 60.5mm running surface
• Bearing seat offset 3.5%
• Square outside edge, straight-cut inside edge
• 9.125 oz. each